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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2014	Feb. 25, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	MGRC
Entity Registrant Name	MCGRATH RENTCORP
Entity Central Index Key	0000752714
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		26,051,251
Entity Public Float			$ 930,419,889

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash	$ 1,167	$ 1,630
Accounts receivable, net of allowance for doubtful accounts of $2,038 in 2014 and $2,007 in 2013	101,294	87,650
Rental equipment, at cost:
Relocatable modular buildings	664,340	592,391
Electronic test equipment	261,995	267,772
Liquid and solid containment tanks and boxes	303,303	284,005
Rental equipment, gross	1,229,638	1,144,168
Less accumulated depreciation	(403,888)	(377,158)
Rental equipment, net	825,750	767,010
Property, plant and equipment, net	108,628	105,187
Prepaid expenses and other assets	41,424	27,772
Intangible assets, net	10,336	10,662
Goodwill	27,808	27,700
Total assets	1,116,407	1,027,611
Liabilities:
Notes payable	322,478	290,003
Accounts payable and accrued liabilities	71,357	63,318
Deferred income	29,139	24,003
Deferred income taxes, net	268,902	249,257
Total liabilities	691,876	626,581
Commitments and contingencies (Note 7)
Shareholders' equity:
Common stock, no par value-authorized-40,000 shares issued and outstanding-26,051 shares as of December 31, 2014 and 25,757 shares as of December 31, 2013	106,469	103,023
Retained earnings	318,164	298,038
Accumulated other comprehensive loss	(102)	(31)
Total shareholders' equity	424,531	401,030
Total liabilities and shareholders' equity	$ 1,116,407	$ 1,027,611

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,038	$ 2,007
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	26,051	25,757
Common Stock, shares outstanding	26,051	25,757

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Rental	$ 269,575	$ 255,766	$ 248,444
Rental related services	64,132	53,148	46,920
Rental operations	333,707	308,914	295,364
Sales	72,248	68,443	66,444
Other	2,167	2,152	2,231
Total revenues	408,122	379,509	364,039
Direct costs of rental operations
Depreciation of rental equipment	72,678	68,208	63,819
Rental related services	48,849	40,189	37,207
Other	56,946	55,017	45,581
Total direct costs of rental operations	178,473	163,414	146,607
Cost of sales	47,430	47,080	49,173
Total costs of revenues	225,903	210,494	195,780
Gross profit	182,219	169,015	168,259
Selling and administrative expenses	96,859	88,765	86,278
Income from operations	85,360	80,250	81,981
Other income (expense):
Interest expense	(9,280)	(8,687)	(9,149)
Gain on sale of property, plant and equipment	812
Foreign currency exchange gain (loss)	(331)	(189)	35
Income before provision for income taxes	76,561	71,374	72,867
Provision for income taxes	30,852	27,977	28,090
Net income	$ 45,709	$ 43,397	$ 44,777
Earnings per share:
Basic	$ 1.77	$ 1.71	$ 1.80
Diluted	$ 1.75	$ 1.67	$ 1.78
Shares used in per share calculations:
Basic	25,914	25,433	24,759
Diluted	26,175	25,926	25,156
Cash dividends declared per share	$ 0.98	$ 0.96	$ 0.94

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 45,709	$ 43,397	$ 44,777
Other comprehensive loss:
Foreign currency translation adjustment, net of tax benefits of $11 in 2014 and $6 in 2013	(71)	(31)
Comprehensive income	$ 45,638	$ 43,366	$ 44,777

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax benefits	$ 11	$ 6

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2011	$ 333,142	$ 74,878	$ 258,264
Balance, Shares at Dec. 31, 2011		24,576
Net income	44,777		44,777
Share-based compensation	3,840	$ 3,840
Common stock issued under stock plans, net of shares withheld for employee taxes	5,841	$ 5,841
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares		355
Excess tax benefit from equity awards	1,033	$ 1,033
Taxes paid related to net share settlement of stock awards	(250)	(250)
Dividends accrued of $0.94, $0.96, $0.98 per share in 2012,2013 and 2014	(23,645)		(23,645)
Balance at Dec. 31, 2012	364,738	$ 85,342	279,396
Balance, Shares at Dec. 31, 2012		24,931
Net income	9,215
Balance at Mar. 31, 2013	372,864
Balance at Dec. 31, 2012	364,738	$ 85,342	279,396
Balance, Shares at Dec. 31, 2012		24,931
Net income	43,397		43,397
Share-based compensation	3,680	$ 3,680
Common stock issued under stock plans, net of shares withheld for employee taxes	15,067	$ 15,067
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares		826
Excess tax benefit from equity awards	1,329	$ 1,329
Taxes paid related to net share settlement of stock awards	(2,395)	(2,395)
Dividends accrued of $0.94, $0.96, $0.98 per share in 2012,2013 and 2014	(24,755)		(24,755)
Balance at Dec. 31, 2013	$ 401,030	$ 103,023	298,038	$ (31)
Balance, Shares at Dec. 31, 2013	25,757	25,757
Balance at Mar. 31, 2013	$ 372,864
Net income	9,848
Balance at Jun. 30, 2013	387,779
Net income	12,573
Balance at Sep. 30, 2013	395,694
Net income	11,761
Balance at Dec. 31, 2013	$ 401,030	$ 103,023	298,038	(31)
Balance, Shares at Dec. 31, 2013	25,757	25,757
Other comprehensive loss	$ (31)			(31)
Net income	7,871
Balance at Mar. 31, 2014	401,563
Balance at Dec. 31, 2013	$ 401,030	$ 103,023	298,038	(31)
Balance, Shares at Dec. 31, 2013	25,757	25,757
Net income	$ 45,709		45,709
Share-based compensation	3,854	$ 3,854
Common stock issued under stock plans, net of shares withheld for employee taxes	1,729	$ 1,729
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares		294
Excess tax benefit from equity awards	1,822	$ 1,822
Taxes paid related to net share settlement of stock awards	(3,959)	(3,959)
Dividends accrued of $0.94, $0.96, $0.98 per share in 2012,2013 and 2014	(25,583)		(25,583)
Balance at Dec. 31, 2014	$ 424,531	$ 106,469	318,164	(102)
Balance, Shares at Dec. 31, 2014	26,051	26,051
Balance at Mar. 31, 2014	$ 401,563
Net income	10,205
Balance at Jun. 30, 2014	406,439
Net income	13,746
Balance at Sep. 30, 2014	414,519
Net income	13,887
Balance at Dec. 31, 2014	$ 424,531	$ 106,469	$ 318,164	(102)
Balance, Shares at Dec. 31, 2014	26,051	26,051
Other comprehensive loss	$ (102)			$ (71)

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividends accrued per share	$ 0.98	$ 0.96	$ 0.94
Retained Earnings [Member]
Dividends accrued per share	$ 0.98	$ 0.96	$ 0.94

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
Consolidated Statements of Cash Flows $ in Thousands	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Cash Flows from Operating Activities:
Net income	$ 45,709	$ 43,397	$ 44,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81,125	76,849	72,476
Provision for doubtful accounts	1,825	2,144	4,263
Share-based compensation	3,854	3,680	3,840
Gain on sale of used rental equipment	(15,368)	(13,091)	(12,389)
Gain on sale of property, plant and equipment	(812)
Foreign currency exchange (gain) loss	331	189	(35)
Change in:
Accounts receivable	(15,469)	2,462	(3,848)
Prepaid expenses and other assets	(13,652)	8,265	(2,337)
Accounts payable and accrued liabilities	10,662	6,506	(3,421)
Deferred income	5,136	(2,921)	1,857
Deferred income taxes	19,645	22,693	21,198
Net cash provided by operating activities	122,986	133,643	126,381
Cash Flows from Investing Activities:
Purchases of rental equipment	(152,197)	(132,611)	(131,805)
Purchases of property, plant and equipment	(12,740)	(11,973)	(14,161)
Proceeds from sale of used rental equipment	32,556	33,380	30,970
Proceeds from sale of property, plant and equipment	2,501
Net cash used in investing activities	(129,880)	(111,204)	(114,996)
Cash Flows from Financing Activities:
Net borrowings (repayments) under bank lines of credit	12,475	(11,997)	5,500
Borrowings under Series B senior notes	40,000
Principal payments on Series A senior notes	(20,000)
Proceeds from the exercise of stock options	1,729	15,067	5,841
Excess tax benefit from exercise and disqualifying disposition of stock options	1,822	1,329	1,033
Taxes paid related to net share settlement of stock awards	(3,959)	(2,395)	(250)
Payment of dividends	(25,551)	(24,423)	(23,126)
Net cash provided by (used in) financing activities	6,516	(22,419)	(11,002)
Effect of foreign currency exchange rate changes on cash	(85)	(2)
Net increase (decrease) in cash	(463)	18	383
Cash balance, beginning of period	1,630	1,612	1,229
Cash balance, end of period	1,167	1,630	1,612
Interest paid, during the period	9,074	8,813	9,107
Net income taxes paid, during the period	22,275	11,074	5,842
Dividends accrued during the period, not yet paid	6,526	6,373	6,194
Rental equipment acquisitions, not yet paid	$ 4,942	$ 8,533	$ 4,491

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

NOTE 1.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization

McGrath RentCorp and its wholly-owned subsidiaries (the “Company”) is a California corporation organized in 1979. The Company is a diversified business to business rental company with three rental products; relocatable modular buildings, electronic test equipment and liquid and solid containment tanks and boxes. Although the Company’s primary emphasis is on equipment rentals, sales of equipment occur in the normal course of business. The Company is comprised of four business segments: its modular building division (“Mobile Modular”), its electronic test equipment division (“TRS-RenTelco”), its containment solutions for the storage of hazardous and non-hazardous liquids and solids division (“Adler Tanks”) and its classroom manufacturing division selling modular classrooms in California (“Enviroplex”).

Principles of Consolidation

The consolidated financial statements include the accounts of McGrath RentCorp and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Revenue Recognition

Rental revenue from operating leases is recognized on a straight-line basis over the term of the lease. Rental billings for periods extending beyond period end are recorded as deferred income and are recognized when earned. Rental related services revenue is primarily associated with relocatable modular building and liquid and solid containment tanks and boxes leases. For modular building leases, rental related services revenue consists of billings to customers for modifications, delivery, installation, additional site-related work, and dismantle and return delivery. For modular building leases, revenue related to delivery, installation, dismantle and return delivery are an integral part of the negotiated lease agreement with customers and are recognized on a straight-line basis over the term of the lease. For liquid and solid containment solutions, rental related services revenue consists of billings for delivery, removal and cleaning of the tanks and boxes. These revenues are recognized in the period performed.

Sales revenue is recognized upon delivery and installation of the equipment to customers. Certain leases are accounted for as sales-type leases. For these leases, sales revenue and the related accounts receivable are recognized upon delivery and installation of the equipment and the unearned interest is recognized over the lease term on a basis which results in a constant rate of return on the unrecovered lease investment.

Other revenue is recognized when earned and primarily includes interest income on sales-type leases, rental income on facility rentals and certain logistics services.

Sales taxes charged to customers are reported on a net basis and are excluded from revenues and expenses.

Depreciation of Rental Equipment

Rental equipment is depreciated on a straight-line basis for financial reporting purposes and on an accelerated basis for income tax purposes. The costs of major refurbishment of relocatable modular buildings and portable storage containers are capitalized to the extent the refurbishment significantly adds value to, or extends the life of the equipment. Maintenance and repairs are expensed as incurred.

The estimated useful lives and residual values of the Company’s rental equipment used for financial reporting purposes are as follows:


Relocatable modular buildings		18 years, 50% residual value
Relocatable modular accessories		3 to 18 years, no residual value
Portable storage containers		25 years, 62.5% residual value
Electronic test equipment and accessories		1 to 8 years, no residual value
Liquid and solid containment tanks and boxes and accessories		10 to 20 years, no residual value

Costs of Rental Related Services

Costs of rental related services are primarily associated with relocatable modular building leases and liquid and solid containment tank and boxes. Modular building leases consist of costs for services to be provided under the negotiated lease agreement for delivery, installation, modifications, skirting, additional site-related work, and dismantle and return delivery. Costs related to these services are recognized on a straight-line basis over the term of the lease. Costs of rental related services associated with liquid and solid containment solutions consists of costs of delivery, removal and cleaning of the tanks and boxes. These costs are recognized in the period the service is performed.

Impairment of Long-Lived Assets

The Company evaluates the carrying value of rental equipment and identifiable definite lived intangible assets for impairment whenever events or circumstances have occurred that would indicate the carrying amount may not be fully recoverable. A key element in determining the recoverability of long-lived assets is the Company’s outlook as to the future market conditions for its rental equipment. If the carrying amount is not fully recoverable, an impairment loss is recognized to reduce the carrying amount to fair value. The Company determines fair value based upon the condition of the rental equipment and the projected net cash flows from its rental and sale considering current market conditions. Goodwill and identifiable indefinite lived assets are evaluated for potential impairment annually or when circumstances indicate potential impairment may have occurred. Impairment losses, if any, are determined based upon the estimated fair value of the asset. There were no impairments of long-lived assets during the years ended December 31, 2014, 2013 and 2012.

Other Direct Costs of Rental Operations

Other direct costs of rental operations include direct labor, supplies, repairs, insurance, property taxes, license fees and certain modular lease costs charged to customers in the negotiated rental rate, which are recognized on a straight-line basis over the term of the lease.

Cost of Sales

Cost of sales in the Consolidated Statements of Income includes the carrying value of the equipment sold and all direct costs associated with the sale.

Warranty Reserves

Sales of new relocatable modular buildings, portable storage containers, electronic test equipment and related accessories and liquid and solid containment tanks and boxes not manufactured by the Company are typically covered by warranties provided by the manufacturer of the products sold. The Company typically provides limited 90-day warranties for certain sales of used rental equipment and one-year warranties on equipment manufactured by Enviroplex. Although the Company’s policy is to provide reserves for warranties when required for specific circumstances, the Company has not found it necessary to establish such reserves to date as warranty costs have not been significant.

Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation. Depreciation is recognized on a straight-line basis for financial reporting purposes, and on an accelerated basis for income tax purposes. Depreciation expenses for property, plant and equipment is included in “Selling and administrative expenses” and “Rental related services” in the Consolidated Statements of Income. Maintenance and repairs are expensed as incurred.

Property, plant and equipment consist of the following:


(dollar amounts in thousands)	Estimated useful life in years		December 31,
(dollar amounts in thousands)	Estimated useful life in years		2014			2013
Land		Indefinite	$	38,455		$	37,354
Land improvements		20 – 50		39,715			39,068
Buildings		30		21,486			21,151
Furniture, office and computer equipment		3 – 10		32,544			30,761
Machinery and service equipment		5 – 20		24,454			20,106

				156,654			148,440
Less accumulated depreciation				(53,503	)		(47,058	)

				103,151			101,382
Construction in progress				5,477			3,805

			$	108,628		$	105,187

Property, plant and equipment depreciation expense was $7.6 million, $7.8 million and $7.8 million for the years ended December 31, 2014, 2013 and 2012, respectively. Construction in progress at December 31, 2014 and 2013 consisted primarily of costs related to acquisition of land and land improvements.

Capitalized Software Costs

The Company capitalizes certain development costs incurred in connection with its internal use software. Costs incurred in the preliminary stages of development are expensed as incurred. Once an application has reached the development stage, direct internal and external costs are capitalized until the software is substantially complete and ready for its intended use. These costs generally include external direct costs of materials and services consumed in the project and internal costs, such as payroll and benefits of those employees directly associated with the development of the software. Maintenance and training costs are expensed as incurred. The Company also capitalizes costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Capitalized software costs are included in property, plant and equipment. The Company capitalized $0.4 million and $3.5 million in internal use software during the years ended December 31, 2014 and 2013, respectively.

Advertising Costs

Advertising costs are expensed as incurred. Total advertising expenses were $2.4 million, $2.4 million and $2.5 million for the years ended December 31, 2014, 2013 and 2012.

Income Taxes

Income taxes are accounted for using an asset and liability approach. Deferred tax assets and liabilities are recorded for the effect of temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements. Deferred tax assets and deferred tax liabilities are adjusted to the extent necessary to reflect tax rates expected to be in effect when temporary differences reverse. Adjustments may be required to deferred tax assets and deferred tax liabilities due to changes in tax laws and audit adjustments by tax authorities. To the extent adjustments are required in any given period, the adjustments would be included within the tax provision in the Consolidated Statements of Income.

The Company has not recorded a valuation allowance for its deferred tax assets. A valuation allowance would be established if, based on the weight of available evidence, management believes that it is more likely than not that some portion or all of a recorded deferred tax asset would not be realized in future periods.

Goodwill and Intangible Assets

Purchase prices of acquired businesses have been allocated to the assets and liabilities acquired based on the estimated fair values on the respective acquisition dates. Based on these values, the excess purchase prices over the fair value of the net assets acquired were allocated to goodwill and other intangible assets. Intangible assets related to customer relationships are amortized over eleven years. At December 31, 2014 and 2013, goodwill and trade name intangible assets which have indefinite lives totaled $33.5 million and $33.4 million, respectively.

The Company assesses potential impairment of its goodwill and intangible assets when there is evidence that events or circumstances have occurred that would indicate the recovery of an asset’s carrying value is unlikely. The Company also assesses potential impairment of its goodwill and intangible assets on an annual basis regardless of whether there is evidence of impairment. If indicators of impairment were to be present in intangible assets used in operations and future discounted cash flows were not expected to be sufficient to recover the assets’ carrying amount, an impairment loss would be charged to expense in the period identified. The amount of an impairment loss would be recognized as the excess of the asset’s carrying value over its fair value. Factors the Company considers important, which may cause impairment include, among others, significant changes in the manner of use of the acquired asset, negative industry or economic trends, and significant underperformance relative to historical or projected operating results.

The impairment review of the Company’s goodwill and indefinite lived assets is performed by first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. In the first step, the fair value of the reporting unit is compared to its carrying value to determine if the goodwill and intangible assets are impaired. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, then goodwill and intangible assets are not impaired and no further testing is required. If the carrying value of the net assets assigned to the reporting unit were to exceed its fair value, then the second step is performed in order to determine the implied fair value of the reporting unit’s goodwill and intangible assets and an impairment loss is recorded for an amount equal to the difference between the implied fair value and the carrying value of the goodwill and intangible assets.

The Company conducted its annual impairment analysis in the fourth quarter of its fiscal year. The impairment analysis did not result in an impairment charge for the fiscal years ended 2014, 2013 or 2012. Determining the fair value of a reporting unit is judgmental and involves the use of significant estimates and assumptions. The Company based its fair value estimates on assumptions that it believes are reasonable but are uncertain and subject to changes in market conditions.

Earnings Per Share

Basic earnings per share (“EPS”) is computed as net income divided by the weighted average number of shares of common stock outstanding for the period. Diluted EPS is computed assuming conversion of all potentially dilutive securities including the dilutive effects of stock options, unvested restricted stock awards and other potentially dilutive securities. The table below presents the weighted-average common stock used to calculate basic and diluted earnings per share:


(in thousands)	Year Ended December 31,
	2014		2013		2012
Weighted-average common stock for calculating basic earnings per share		25,914		25,433		24,759
Effect of potentially dilutive securities from equity-based compensation		261		493		397

Weighted-average common stock for calculating diluted earnings per share		26,175		25,926		25,156

The following securities were not included in the computation of diluted earnings per share as their effect would have been anti-dilutive:


(in thousands)	Year Ended December 31,
	2014		2013		2012
Options to purchase common stock		9		20		1,049

Accounts Receivable and Concentration of Credit Risk

The Company’s accounts receivable consist of amounts due from customers for rentals, sales, financed sales and unbilled amounts for the portion of modular building end-of-lease services earned, which were negotiated as part of the lease agreement. Unbilled receivables related to end-of-lease services, which consists of dismantle and return delivery of buildings, were $21.1 million at December 31, 2014 and $18.9 million at December 31, 2013. The Company sells primarily on 30-day terms, individually performs credit evaluation procedures on its customers on each transaction and will require security deposits from its customers when a significant credit risk is identified. The Company records an allowance for doubtful accounts in amounts equal to the estimated losses expected to be incurred in the collection of the accounts receivable. The estimated losses are based on historical collection experience in conjunction with an evaluation of the current status of the existing accounts. Customer accounts are written off against the allowance for doubtful accounts when an account is determined to be uncollectable. The allowance for doubtful accounts activity was as follows:


(in thousands)	2014			2013
Beginning balance, January 1	$	2,007		$	3,000
Provision for doubtful accounts		1,825			2,144
Write-offs, net of recoveries		(1,794	)		(3,137	)

Ending balance, December 31	$	2,038		$	2,007

Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of trade accounts receivable. From time to time, the Company maintains cash balances in excess of the Federal Deposit Insurance Corporation limits.

Fair Value of Financial Instruments

The Company believes that the carrying amounts for cash, accounts receivable, accounts payable and notes payable approximate their fair values except for fixed rate debt included in notes payable which has an estimated fair value of $122.9 million and $104.6 million compared to the recorded value of $120.0 million and $100.0 million as of December 31, 2014 and 2013, respectively. The estimates of fair value of the Company’s fixed rate debt are based on the borrowing rates currently available to the Company for bank loans with similar terms and average maturities.

Foreign Currency Transactions and Translation

The Company’s Canadian subsidiary, TRS-RenTelco Inc., a British Columbia corporation (“TRS-Canada”), functions as a branch sales office for TRS-RenTelco in Canada. The functional currency for TRS-Canada is the U.S. dollar. Foreign currency transaction gains and losses of TRS-Canada are reported in the results of operations in the period in which they occur.

The Company’s Indian subsidiary, TRS-RenTelco India Private Limited (“TRS-India”), functions as a rental and sales office for TRS-RenTelco in India. The functional currency for TRS-India is the Indian Rupee. All assets and liabilities of TRS-India are translated into U.S. dollars at period-end exchange rates and all income statement amounts are translated at the average exchange rate for each month within the year.

Currently, the Company does not use derivative instruments to hedge its economic exposure with respect to assets, liabilities and firm commitments as the foreign currency transactions and risks to date have not been significant.

Share-Based Compensation

The Company measures and recognizes the compensation expense for all share-based awards made to employees and directors, including stock options, stock appreciation rights (“SARs”) and restricted stock units (“RSUs”), based upon estimated fair values. The fair value of stock options and SARs is estimated on the date of grant using the Black-Scholes option pricing model and for RSUs based upon the fair market value of the underlying shares of common stock as of the date of grant. The Company recognizes share-based compensation cost ratably on a straight-line basis over the requisite service period, which generally equals the vesting period. For performance-based RSUs, compensation costs are recognized when vesting conditions are met. In addition, the Company estimates the probable number of shares of common stock that will be earned and the corresponding compensation cost until the achievement of the performance goal is known. The Company records share-based compensation costs in “Selling and administrative expenses” in the Consolidated Statements of Income. The Company recognizes a benefit from share-based compensation in the Consolidated Statements of Shareholders’ Equity if an incremental tax benefit is realized. Further information regarding share-based compensation can be found in “Note 5—Benefit Plans”.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions in determining reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during each period presented. Actual results could differ from those estimates. The most significant estimates included in the financial statements are the future cash flows and fair values used to determine the recoverability of the rental equipment and identifiable definite lived intangible assets carrying value, the various assets’ useful lives and residual values, and the allowance for doubtful accounts.

Reclassifications

In order to conform to current year presentation, certain amounts on the Consolidated Balance Sheets were reclassified from “Deferred income taxes, net” to “Prepaid and other assets”, on the Consolidated Statements of Income certain amounts were reclassified from “Other revenues” to “Foreign currency exchange gain (loss)” and on the Consolidated Statements of Cash Flows certain amounts were reclassified from “Proceeds from the exercise of stock options” to “Taxes paid related to net share settlement of stock awards”. These reclassifications had no impact on net income, earnings per share or operating cash flows.

New Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. The objective of this guidance is to establish the principles to report useful information to users of financial statements about the nature, timing and uncertainty of revenue from contracts with customers. The guidance in the update is effective for the interim and annual reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of the adoption of this accounting guidance on its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Term of Award Provides That a Performance Target Could Be Achieved after the Requisite Service Period. This update requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The guidance in the update is effective for the interim and annual reporting periods beginning after December 15, 2015. The Company does not expect the adoption of this accounting guidance to have a significant impact on its consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as Going Concern. This ASU is intended to define management’s responsibilities to evaluate whether there is substantial doubt about an organization’s ability to continue as going concern and provide related footnote disclosures. The amendments in this ASU will be effective for the Company in the fourth quarter of fiscal 2016, with early adoption permitted. The Company does not expect the adoption of this accounting guidance to have a significant impact on its consolidated financial statements.

Financed Lease Receivables

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Financed Lease Receivables

NOTE 2.

FINANCED LEASE RECEIVABLES

The Company has entered into sales-type leases to finance certain equipment sales to customers. The lease agreements have a bargain purchase option at the end of the lease term. The minimum lease payments receivable and the net investment included in accounts receivable for such leases are as follows:


(in thousands)	December 31,
	2014			2013
Gross minimum lease payments receivable	$	3,489		$	5,462
Less—unearned interest		(188	)		(314	)

Net investment in sales type lease receivables	$	3,301		$	5,148

As of December 31, 2014, the future minimum lease payments under non-cancelable sales-type leases to be received in 2015 and thereafter are as follows:


(in thousands)
Year Ended December 31,
2015	$	2,828
2016		568
2017		93
2018		—

Total minimum future lease payments	$	3,489

- Definition

The entire disclosure for lessor entity's leasing arrangements for operating, capital and leveraged leases.

+ References + Details

Notes Payable

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Notes Payable

NOTE 3.

NOTES PAYABLE

Notes payable consists of the following:


(in thousands)	December 31,
	2014		2013
Unsecured revolving lines of credit	$	202,478	$	190,003
4.03% senior notes due in 2018		80,000		100,000
3.68% senior notes due in 2021		40,000		—

	$	322,478	$	290,003

As of December 31, 2014, the future minimum payments under the unsecured revolving lines of credit, 4.03% senior notes due in 2018 and 3.68% senior notes due in 2021 are as follows:


(in thousands)
Year Ended December 31,
2015	$	20,000
2016		20,000
2017		222,478
2018		20,000
2019 and thereafter		40,000

	$	322,478

Unsecured Revolving Lines of Credit

In June 2012, the Company entered into an amended and restated credit agreement with a syndicate of banks (the “Amended Credit Facility”). The five-year facility matures on June 15, 2017 and replaced the Company’s prior $350.0 million unsecured revolving credit facility. The Amended Credit Facility provides for a $420.0 million unsecured revolving credit facility (which may be increased to $450.0 million with $30.0 million of additional commitments), which includes a $25.0 million sublimit for the issuance of standby letters of credit and a $10.0 million sublimit for swingline loans. Amounts outstanding under the Amended Credit Facility at December 31, 2014 and 2013 were $200.0 million and $186.0 million, respectively.

In June 2012, the Company entered into a Credit Facility Letter Agreement and a Credit Line Note in favor of Union Bank, N.A., extending its line of credit facility related to its cash management services (“Sweep Service Facility”) and increasing the facility size from $5.0 million to $10.0 million. The Sweep Service Facility matures on the earlier of June 15, 2017, or the date the Company ceases to utilize Union Bank, N.A. for its cash management services. Amounts outstanding under the Sweep Service Facility at December 31, 2014 and 2013 were $2.5 million and $4.0 million, respectively.

At December 31, 2014, under the Amended Credit Facility and Sweep Service Facility, the Company had unsecured lines of credit that permit it to borrow up to $430.0 million of which $202.5 million was outstanding, and had capacity to borrow up to an additional $227.5 million. The Amended Credit Facility contains financial covenants requiring the Company to not (all defined terms used below not otherwise defined herein have the meaning assigned to such terms in the Amended Credit Facility):

•

Permit the Consolidated Fixed Charge Coverage Ratio of EBITDA to fixed charges as of the end of any fiscal quarter to be less than 2.50 to 1. At December 31, 2014, the actual ratio was 4.02 to 1.

•

Permit the Consolidated Leverage Ratio of funded debt to EBITDA at any time during any period of four consecutive fiscal quarters to be greater than 2.75 to 1. At December 31, 2014, the actual ratio was 1.89 to 1.

•

Permit Tangible Net Worth as of the end of any fiscal quarter of the Company to be less than the sum of (i) $246.1 million plus (ii) 25% of the Company’s Consolidated Net Income (as defined in the Amended Credit Facility) (but only if a positive number) for each fiscal quarter ended subsequent to December 31, 2011 plus (iii) 90% of the net cash proceeds from the issuance of the Company’s capital stock after December 31, 2011. At December 31, 2014, such sum was $294.2 million and the actual Tangible Net Worth of the Company was $386.4 million.

Amounts borrowed under the Amended Credit Facility bear interest at the Company’s option at either: (i) LIBOR plus a defined margin, or (ii) the Agent bank’s prime rate (“base rate”) plus a margin. The applicable margin for each type of loan is measured based upon the Consolidated Leverage Ratio at the end of the prior fiscal quarter and ranges from 1.00% to 1.75% for LIBOR loans and 0% to 0.75% for base rate loans. In addition, the Company pays an unused commitment fee for the portion of the $420.0 million credit facility that is not used. These fees are based upon the Consolidated Leverage Ratio and range from 0.15% to 0.30%. As of December 31, 2014 and 2013, the applicable margins were 1.50% for LIBOR based loans, 0.50% for base rate loans and 0.25% for unused fees. Amounts borrowed under the Sweep Service Facility are based upon the Union Bank, N.A. base rate plus an applicable margin and an unused commitment fee for the portion of the $10.0 million facility not used. The applicable base rate margin and unused commitment fee rates for the Sweep Service Facility are the same as for the Amended Credit Facility. The following information relates to the lines of credit for each of the following periods:


(dollar amounts in thousands)	Year Ended December 31,
	2014			2013
Maximum amount outstanding	$	208,894		$	202,000
Average amount outstanding	$	191,248		$	187,644
Weighted average interest rate, during the period		2.41	%		2.45	%
Prime interest rate, end of period		3.25	%		3.25	%

4.03% Senior Notes Due in 2018

On April 21, 2011, the Company entered into a Note Purchase and Private Shelf Agreement (the “Note Purchase Agreement”) with Prudential Investment Management, Inc. (“PIM”), The Prudential Insurance Company of America and Prudential Retirement Insurance and Annuity Company (collectively, the “Purchaser”), pursuant to which the Company agreed to sell an aggregate principal amount of $100.0 million of its 4.03% Series A Senior Notes (the “Series A Senior Notes”) to the Purchaser. The Series A Senior Notes are an unsecured obligation of the Company, due on April 21, 2018. Interest on these notes is due semi-annually in arrears and the principal is due in five equal annual installments, with the first payment due on April 21, 2014. In addition, the Note Purchase Agreement allows for the issuance and sale of additional senior notes to the Purchaser (the “Shelf Notes”) in the aggregate principal amount of $100.0 million, to mature no more than 12 years after the date of original issuance thereof, to have an average life of no more than 10 years and to bear interest on the unpaid balance. At December 31, 2014 and 2013, the principal balance outstanding under the Series A Senior Notes were $80.0 million and $100.0 million, respectively.

On March 17, 2014, the Company entered into an Amendment to the Note Purchase Agreement (“Amendment”) with the Purchasers. The Amendment amended certain terms of the Note Purchase Agreement. Pursuant to the Amendment, among other things, the issuance period for the Shelf Notes to be issued and sold pursuant to the Note Purchase Agreement is extended until the earlier of March 17, 2017 or the termination of the issuance and sale of the Shelf Notes upon the 30 days’ prior notice of either PIM or the Company.

3.68% Senior Notes Due in 2021

On March 17, 2014, the Company issued and sold to the Purchasers a $40.0 million aggregate principal amount of its 3.68% Series B Senior Notes (the “Series B Senior Notes”) pursuant to the terms of the Note Purchase Agreement, as amended. The Series B Senior Notes are an unsecured obligation of the Company and bear interest at a rate of 3.68% per annum and mature on March 17, 2021. Interest on the Series B Senior Notes is payable semi-annually beginning on September 17, 2014 and continuing thereafter on March 17 and September 17 of each year until maturity. The full net proceeds from the Series B Senior Notes were used for working capital and other general corporate purposes. At December 31, 2014, the principal balance outstanding under the Series B Senior Notes was $40.0 million.

Among other restrictions, the Note Purchase Agreement, under which the Series A Senior Notes and the Series B Senior Notes were sold, contains financial covenants requiring the Company to not (all defined terms used below not otherwise defined herein have the meaning assigned to such terms in the Note Purchase Agreement):

•

Permit the Consolidated Fixed Charge Coverage Ratio of EBITDA to fixed charges as of the end of any fiscal quarter to be less than 2.50 to 1. At December 31, 2014, the actual ratio was 4.02 to 1.

•

Permit the Consolidated Leverage Ratio of funded debt to EBITDA at any time during any period of four consecutive quarters to be greater than 2.75 to 1. At December 31, 2014, the actual ratio was 1.89 to 1.

•

Permit Tangible Net Worth, calculated as of the last day of each fiscal quarter, to be less than the sum of (i) $229.0 million, plus (ii) 25% of net income for such fiscal quarter subsequent to December 31, 2010, plus (iii) 90% of the net cash proceeds from the issuance of the Company’s capital stock after December 31, 2010. At December 31, 2014, such sum was $294.2 million and the actual Tangible Net Worth of the Company was $386.4 million.

At December 31, 2014, the Company was in compliance with each of the aforementioned covenants. There are no anticipated trends that the Company is aware of that would indicate non-compliance with these covenants, though, significant deterioration in the Company’s financial performance could impact its ability to comply with these covenants.

Income Taxes

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 4.

INCOME TAXES

Income before provision for income taxes consisted of the following:


(in thousands)	Year Ended December 31,
	2014			2013			2012
U.S.	$	76,848		$	71,678		$	72,555
Foreign		(287	)		(304	)		312

	$	76,561		$	71,374		$	72,867

The provision for income taxes consisted of the following:


(in thousands)	Year Ended December 31,
	2014			2013			2012
Current:
U.S. Federal	$	7,494		$	1,188		$	1,634
State		2,139			1,803			653
Foreign		1,572			2,217			2,599

		11,205			5,208			4,886

Deferred:
U.S. Federal		17,986			21,067			20,952
State		1,927			1,818			2,252
Foreign		(266	)		(116	)		—

		19,647			22,769			23,204

Total	$	30,852		$	27,977		$	28,090

The reconciliation of the U.S. federal statutory tax rate to the Company’s effective tax rate is as follows:


	Year Ended December 31,
	2014			2013			2012
U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of federal benefit		4.1			4.1			4.2
Other		1.2			0.1			(0.6	)

		40.3	%		39.2	%		38.6	%

The following table shows the deferred income taxes related to the temporary differences between the tax bases of assets and liabilities and the respective amounts included in “Deferred income taxes, net” on the Company’s Consolidated Balance Sheets:


(in thousands)	December 31,
	2014		2013
Deferred tax liabilities:
Accelerated depreciation	$	272,496	$	257,537
Prepaid costs currently deductible		6,358		4,794
Other		4,404		3,242

Total deferred tax liabilities		283,258		265,573

Deferred tax assets:
Accrued costs not yet deductible		7,463		6,638
Allowance for doubtful accounts		788		775
Net operating loss carry forwards and credits		302		2,736
Deferred revenues		1,132		305
Share-based compensation		4,671		5,862

Total deferred tax assets		14,356		16,316

Deferred income taxes, net	$	268,902	$	249,257

In 2014, 2013 and 2012 the Company obtained an excess tax benefit of $1.8 million, $1.3 million and $1.0 million, respectively, from the exercise of non-qualified stock options and early dispositions of stock obtained through the exercise of incentive stock options by employees. The tax benefit was recorded as common stock in conjunction with the proceeds received from the exercise of the stock options.

A deferred U.S. tax liability has not been provided on the undistributed earnings of certain foreign subsidiaries because it is the Company’s intent to permanently reinvest such earnings. Undistributed earnings of foreign subsidiaries, which have been or are intended to be permanently reinvested, aggregated approximately $1.6 million and $1.2 million as of December 31, 2014 and 2013, respectively. As of December 31, 2014, the Company’s foreign net operating losses for tax purposes were $1.0 million. If not utilized, these carry forwards will begin to expire in 2022. As of December 31, 2013, the Company had state and foreign tax credit carry forwards of $2.6 million, which were fully utilized during 2014.

The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority. The Company evaluated all of its tax positions for which the statute of limitations remained open and determined there were no material unrecognized tax benefits as of December 31, 2014 and 2013. In addition, there have been no material changes in unrecognized benefits during 2014, 2013 and 2012.

The Company is subject to income taxes in the U.S. federal jurisdiction, and various states and foreign jurisdictions. Tax regulations within each jurisdiction are subject to interpretation of the related tax laws and regulations and require the application of significant judgment. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for the years before 2010.

Our income tax returns are subject to examination by federal, state and foreign tax authorities. There may be differing interpretations of tax laws and regulations, and as a result, disputes may arise with these tax authorities involving the timing and amount of deductions and allocation of income.

The Company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes for all periods presented. Such interest and penalties were not significant for the years ended December 31, 2014, 2013 and 2012.

Benefit Plans

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Benefit Plans

NOTE 5.

BENEFIT PLANS

Stock Plans

The Company adopted the 2007 Stock Incentive Plan (the “2007 Plan”) effective June 6, 2007, under which 1,875,000 shares of common stock of the Company, plus the number of shares that remained available for grants of awards under the Company’s 1998 Stock Option Plan (the “1998 Plan”) and those shares that become available as a result of forfeiture, termination, or expiration of awards previously granted under the 1998 Plan, were reserved for the grant of awards to its employees, directors and consultants to acquire common stock of the Company. The 2007 Plan is a shareholder approved plan with the initial 1,875,000 share authorization increased by 815,000 shares in 2009 and 1,500,000 shares in 2012. The 2007 Plan provides for the grant of awards in the form of stock options, stock appreciation rights, RSUs, the vesting of which may be performance-based or service-based, and other rights and benefits. Each RSU issued reduces the number of shares of the Company’s common stock available for grant under the 2007 Plan by two shares. Options under the 2007 Plan are granted at an exercise price of not less than 100% of the fair market value of the Company’s common stock on the date of grant. The 2007 Plan replaced the Company’s 1998 Plan and the 2000 Long-Term Bonus Plan. There were no modifications to the 2007 Plan and no awards classified as liabilities in the year ended December 31, 2014.

For the years ended December 31, 2014, 2013 and 2012, the share-based compensation expense was $3.9 million, $3.7 million and $3.8 million, respectively, before provision for income taxes. The Company recorded a tax benefit of approximately $1.5 million, $1.4 million and $1.5 million, respectively, related to the aforementioned share-based compensation expenses. There was no capitalized share-based compensation expense in the years ended December 31, 2014, 2013 and 2012. For the years ended December 31, 2014, 2013 and 2012, the share-based compensation expenses, net of taxes, reduced net income by $2.3 million, $2.2 million and $2.4 million, respectively, or $0.09 per diluted share for each of the three years ended December 31, 2014.

Stock Options

As of December 31, 2014, a cumulative total of 6,821,000 shares subject to options have been granted with exercise prices ranging from $3.47 to $38.89. Of these, options have been exercised for the purchase of 4,583,868 shares, while options for 887,872 shares have been terminated, and options for 1,343,760 shares with exercise prices ranging from $15.62 to $38.89 remained outstanding under the stock plans. Most of these options vest over five years and expire seven and ten years after grant. To date, no options have been issued to any of the Company’s non-employee advisors. As of December 31, 2014, 1,205,444 shares remained available for issuance of awards under the stock plans.

A summary of the Company’s option activity and related information for the three years ended December 31, 2014 is as follows:


	Number of options			Weighted- average price		Weighted- average remaining contractual term (in years)		Aggregate intrinsic value (in millions)
Balance at December 31, 2011		3,086,019		$	23.52
Options granted		128,500			29.63
Options exercised		(327,498	)		17.95
Options cancelled/forfeited/expired		(48,468	)		27.63

Balance at December 31, 2012		2,838,553			24.37
Options granted		192,800			29.14
Options exercised		(1,237,341	)		24.71
Options cancelled/forfeited/expired		(21,950	)		25.20

Balance at December 31, 2013		1,772,062			24.68
Options granted		203,600			32.79
Options exercised		(612,682	)		21.55
Options cancelled/forfeited/expired		(19,220	)		30.35

Balance at December 31, 2014		1,343,760		$	27.25		2.97	$	11.6

Exercisable at December 31, 2014		883,605		$	25.37		1.80	$	9.3
Expected to vest after December 31, 2014		414,140		$	30.68		5.22	$	2.1

The intrinsic value of stock options at any point in time is calculated as the difference between the exercise price of the underlying awards and the quoted price of the Company’s common stock. The aggregate intrinsic value of options exercised and sold under the Company’s stock option plans was $8.4 million, $11.5 million and $3.9 million for the years ended December 31, 2014, 2013 and 2012, respectively, determined as of the date of option exercise. As of December 31, 2014, there was approximately $3.5 million of total unrecognized compensation cost related to unvested share-based compensation option arrangements granted under the Company’s stock plans, which is expected to be recognized over a weighted-average period of 2.0 years.

The following table indicates the options outstanding and options exercisable by exercise price with the weighted-average remaining contractual life for the options outstanding and the weighted-average exercise price at December 31, 2014:


	Options Outstanding						Options Exercisable
Exercise price	Number outstanding at December 31, 2014		Weighted- average remaining contractual life (Years)		Weighted- average grant date value		Number exercisable at December 31, 2014		Weighted- average grant date value
$15–20		149,700		1.17	$	15.62		149,700	$	15.62
20–25		229,225		1.79		23.19		212,040		23.18
25–30		653,435		2.56		29.12		510,465		29.24
30–35		302,000		5.56		32.35		10,400		32.40
35–40		9,400		5.96		37.83		1,000		38.89

$15–40		1,343,760		2.97	$	27.25		883,605	$	25.37

The Company utilizes the Black-Scholes option-pricing model to estimate the fair value of share-based compensation at the date of grant, which requires the use of accounting judgment and financial estimates, including estimates of the expected term option holders will retain their vested stock options before exercising them, the estimated volatility of the Company’s stock price over the expected term and the expected number of options that will be forfeited prior to the completion of their vesting requirements. Application of alternative assumptions could produce significantly different estimates of the fair value of share-based compensation amounts recognized in the Consolidated Statements of Income.

The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model using the following weighted-average assumptions:


	Year Ended December 31,
	2014			2013			2012
Expected term (in years)		5.0			5.0			5.0
Expected volatility		40.5	%		50.3	%		52.1	%
Expected dividend yields		3.0	%		3.3	%		3.2	%
Risk-free interest rates		1.5	%		0.8	%		0.8	%

The Company monitors option exercise behavior to determine the appropriate homogenous groups for estimation purposes. Currently, the Company’s option activity is separated into two categories: directors and employees. The expected term of the options represents the estimated period of time until exercised and is based on historical experience, giving consideration to the option terms, vesting schedules and expectations of future behavior. Expected stock volatility is based on historical stock price volatility of the Company and the risk-free interest rates are based on U.S. Treasury yields in effect on the date of the option grant for the estimated period the options will be outstanding. The expected dividend yield is based upon the current dividend annualized as a percentage of the grant exercise price.

The weighted average grant date fair value per share was $9.17, $9.87 and $10.28 during the years ended December 31, 2014, 2013 and 2012, respectively.

Restricted Stock Units

The following table summarizes the activity of the Company’s RSUs, which includes service-based and performance-based awards, for the three years ended December 31, 2014:


	Number of shares			Weighted- average grant Date fair value		Aggregate intrinsic value (in millions)
Balance at December 31, 2011		187,810		$	26.33
RSUs granted		109,200			31.37
RSUs vested		(34,190	)		27.85
RSUs cancelled/forfeited/expired		—			—

Balance at December 31, 2012		262,820			28.22
RSUs granted		150,300			26.89
RSUs vested		(87,840	)		24.98
RSUs cancelled/forfeited/expired		(4,300	)		29.24

Balance at December 31, 2013		320,980			28.47
RSUs granted		118,864			30.85
RSUs vested		(120,721	)		27.30
RSUs cancelled/forfeited/expired		(7,540	)		30.34

Balance at December 31, 2014		311,583		$	29.78	$	11.2

Performance-based RSUs vest over five years, with 60% of the shares immediately vesting after three years when the performance has been determined to have been met and 20% of the remaining shares vesting annually at the anniversary of the performance determination date, subject to continuous employment of the participant. There were 137,036 performance-based RSUs expected to vest as of December 31, 2014. Service-based RSUs have been issued to the Company’s directors and generally vest over twelve to fourteen months. There were 18,340 service-based RSUs expected to vest as of December 31, 2014. No forfeitures are currently expected.

Share-based compensation expense for RSUs for the year ended December 31, 2014, 2013 and 2012 was $2.3 million, $2.0 million and $1.8, respectively. As of December 31, 2014, the total unrecognized compensation expense related to unvested RSUs was $3.2 million and is expected to be recognized over a weighted-average period of 2.5 years.

Employee Stock Ownership and 401(k) Plans

On August 1, 2012 the Company amended and restated the Employee Stock Ownership Plan, the 401(k) Plans and the Enviroplex 401(k) Plans (“Plans”) to become the McGrath RentCorp Employee Stock Ownership and 401(k) Plan (the “KSOP”). In conjunction with this, the Plans’ assets totaling approximately $16.4 million in cash were concurrently transferred into the KSOP. The KSOP plan provides that each participant may annually contribute an elected percentage of his or her salary, not to exceed the statutory limit. The Company, at its discretion, may make matching contributions. Contributions are expensed in the year approved by the Board of Directors. Dividends on the Company’s stock held by the KSOP are treated as ordinary dividends and, in accordance with existing tax laws, are deducted by the Company in the year paid. For the year ended December 31, 2014 dividends deducted by the Company were $0.3 million, which resulted in a tax benefit of approximately $0.1 million in 2014.

At December 31, 2014, the KSOP held 328,400 shares, or less than 2% of the Company’s total common shares outstanding. These shares are included in basic and diluted earnings per share calculations.

Shareholders' Equity

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Shareholders' Equity

NOTE 6.

SHAREHOLDERS’ EQUITY

The Company has in the past made purchases of shares of its common stock from time to time in the over-the-counter market (NASDAQ) and/or through privately negotiated, block transactions under an authorization of the Company’s Board of Directors. Shares repurchased by the Company are cancelled and returned to the status of authorized but unissued stock. On May 14, 2008, the Company’s Board of Directors authorized the Company to repurchase an aggregate of 2,000,000 shares of the Company’s outstanding common stock. There were no repurchases of common stock in 2014 and 2013. As of December 31, 2014, 2,000,000 shares remain authorized for repurchase under this authorization.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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-Section C

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 7.

COMMITMENTS AND CONTINGENCIES

The Company leases certain facilities under various operating leases. Most of the lease agreements provide the Company with the option of renewing its lease at the end of the lease term, at the fair rental value. In most cases, management expects that in the normal course of business, facility leases will be renewed or replaced by other leases. Minimum payments under these leases, exclusive of property taxes and insurance, are as follows:


(in thousands)

Year Ended December 31,
2015	$	1,311
2016		910
2017		686
2018		627
Thereafter		—

	$	3,534

Rent expense was $3.4 million, $3.1 million and $3.1 million in 2014, 2013 and 2012, respectively.

The Company is involved in various lawsuits and routine claims arising out of the normal course of its business. The Company maintains insurance coverage for its operations and employees with appropriate aggregate, per occurrence and deductible limits as the Company reasonably determines necessary or prudent with current operations and historical experience. The major policies include coverage for property, general liability, auto, directors and officers, health, and workers’ compensation insurances. The Company records a provision for a liability when it believes that it is both probable that a liability has been incurred and the amount can be reasonably estimated. Significant judgment is required to determine both probability and the estimated amount. The Company reviews these provisions at least quarterly and adjusts these provisions to reflect the impact of negotiations, settlements, rulings, advice of legal counsel, and updated information. Litigation is inherently unpredictable and is subject to significant uncertainties, some of which are beyond the Company’s control. In the opinion of management, there was not at least a reasonable possibility that the ultimate amount of liability not covered by insurance, if any, under any pending litigation and claims, individually or in the aggregate, will have a material adverse effect on the financial position or operating results of the Company.

Intangible Assets

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

NOTE 8.

INTANGIBLE ASSETS

Intangible assets consist of the following:


(dollar amounts in thousands)	Estimated useful life (In years)		December 31,
	Estimated useful life (In years)		2014			2013
Trade name		Indefinite	$	5,700		$	5,700
Customer relationships		11		9,611			9,100

				15,311			14,800
Less accumulated amortization				(4,975	)		(4,138	)

			$	10,336		$	10,662

Intangible assets with finite useful lives are amortized over their respective useful lives. Amortization expense for each of the years ended December 31, 2014, 2013 and 2012 was $0.8 million. Based on the carrying values at December 31, 2014 and assuming no subsequent impairment of the underlying assets, the annual amortization is expected to be $0.8 million in 2015 through 2019.

Related Party Transactions

12 Months Ended

Dec. 31, 2014

Related Party Transactions

NOTE 9.

RELATED PARTY TRANSACTIONS

The Company acquired liquid and solid containment tanks totaling $13.6 million and $38.3 million, during the years ended December 31, 2013, 2012, respectively from Sabre Manufacturing, LLC (“Sabre”), which was controlled by the President of Adler Tanks until August 16, 2013 when Sabre was sold to an unrelated party. Amounts due to Sabre at December 31, 2013 were zero. There were no related party transactions in the year ended December 31, 2014, or amounts owed to related parties at such date.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

Segment Reporting

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Segment Reporting

NOTE 10.

SEGMENT REPORTING

FASB guidelines establish annual and interim reporting standards for an enterprise’s operating segments and related disclosures about its products, services, geographic areas and major customers. In accordance with these guidelines the Company’s four reportable segments are Mobile Modular, TRS-RenTelco, Adler Tanks and Enviroplex. Management focuses on several key measures to evaluate and assess each segment’s performance including rental revenue growth, gross margin, and income before provision for income taxes. As separate corporate entities, Adler Tanks and Enviroplex revenues and expenses are separately maintained from Mobile Modular and TRS-RenTelco. Excluding interest expense, allocations of revenue and expense not directly associated with one of these segments are generally allocated to Mobile Modular, TRS-RenTelco and Adler Tanks, based on their pro-rata share of direct revenues. Interest expense is allocated amongst Mobile Modular, TRS-RenTelco and Adler Tanks based on their pro-rata share of average rental equipment at cost, goodwill, intangible assets, accounts receivable, deferred income and customer security deposits. The Company does not report total assets by business segment. Summarized financial information for the years ended December 31, 2014, 2013 and 2012, for the Company’s reportable segments is shown in the following tables:


Segment Data	Mobile Modular			TRS-RenTelco			Adler Tanks			Enviroplex¹			Consolidated
(dollar amounts in thousands)
Year Ended December 31,
2014
Rental revenues	$	96,457		$	99,020		$	74,098		$	—		$	269,575
Rental related services revenues		35,263			3,331			25,538			—			64,132
Sales and other revenues		29,855			25,951			1,152			17,457			74,415
Total revenues		161,575			128,302			100,788			17,457			408,122
Depreciation of rental equipment		16,536			40,935			15,207			—			72,678
Gross profit		63,455			60,249			53,452			5,063			182,219
Interest expense (income) allocation		4,768			2,075			2,618			(181	)		9,280
Income before provision for income taxes		16,959			34,383			23,605			1,614			76,561
Rental equipment acquisitions		82,792			45,158			20,652			—			148,602
Accounts receivable, net (period end)		46,797			28,849			21,031			4,617			101,294
Rental equipment, at cost (period end)		664,340			261,995			303,303			—			1,229,638
Rental equipment, net book value (period end)		473,960			105,729			246,061			—			825,750
Utilization (period end)²		75.0	%		59.8	%		63.9	%
Average utilization²		72.3	%		60.4	%		62.9	%


Segment Data (Continued)		Mobile Modular			TRS-RenTelco			Adler Tanks			Enviroplex¹			Consolidated
(dollar amounts in thousands)
Year Ended December 31,
2013
Rental revenues	$	82,503		$	102,101		$	71,162		$	—		$	255,766
Rental related services revenues		28,891			3,095			21,162			—			53,148
Sales and other revenues		21,267			29,857			1,616			17,855			70,595
Total revenues		132,661			135,053			93,940			17,855			379,509
Depreciation of rental equipment		14,459			39,953			13,796			—			68,208
Gross profit		50,423			63,520			51,076			3,996			169,015
Interest expense (income) allocation		4,318			2,156			2,419			(206	)		8,687
Income before provision for income taxes		9,617			36,633			24,013			1,111			71,374
Rental equipment acquisitions		52,953			52,625			31,023			—			136,601
Accounts receivable, net (period end)		37,163			27,328			21,915			1,244			87,650
Rental equipment, at cost (period end)		592,391			267,772			284,005			—			1,144,168
Rental equipment, net book value (period end)		415,366			109,988			241,656			—			767,010
Utilization (period end)²		70.7	%		58.2	%		57.7	%
Average utilization²		68.3	%		62.7	%		64.2	%

2012
Rental revenues	$	79,518		$	101,645		$	67,281		$	—		$	248,444
Rental related services revenues		25,775			3,673			17,472			—			46,920
Sales and other revenues		14,474			27,820			2,558			23,823			68,675
Total revenues		119,767			133,138			87,311			23,823			364,039
Depreciation of rental equipment		13,942			38,174			11,703			—			63,819
Gross profit		52,022			62,048			51,157			3,032			168,259
Interest expense (income) allocation		4,547			2,384			2,350			(132	)		9,149
Income (loss) before provision for income taxes		13,443			33,631			26,706			(913	)		72,867
Rental equipment acquisitions		21,042			51,793			55,919			—			128,754
Accounts receivable, net (period end)		39,066			24,654			24,323			4,213			92,256
Rental equipment, at cost (period end)		551,101			266,934			254,810			—			1,072,845
Rental equipment, net book value (period end)		384,813			107,999			226,041			—			718,853
Utilization (period end)²		66.7	%		64.1	%		67.5	%
Average utilization²		66.4	%		65.8	%		71.5	%

Gross Enviroplex sales revenues were $19,017, $17,859 and $24,240 in 2014, 2013 and 2012, respectively, which includes inter-segment sales to Mobile Modular of $1,560, $4 and $417, which have been eliminated in consolidation.

Utilization is calculated each month by dividing the cost of rental equipment on rent by the total cost of rental equipment excluding new equipment inventory and accessory equipment. The average utilization for the period is calculated using the average costs of rental equipment.

No single customer accounted for more than 10% of total revenues during 2014, 2013 and 2012. Revenue from foreign country customers accounted for 5%, 7% and 9% of the Company’s revenues for the same periods, respectively.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Quarterly Financial Information

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

NOTE 11.

QUARTERLY FINANCIAL INFORMATION (unaudited)

Quarterly financial information for each of the two years ended December 31, 2014 is summarized below:


(in thousands, except per share amounts)	2014
	First		Second		Third		Fourth		Year
Operations Data
Rental revenues	$	62,430	$	65,809	$	69,642	$	71,694	$	269,575
Total revenues		87,560		95,745		113,025		111,792		408,122
Gross profit		38,638		42,079		49,298		52,204		182,219
Income from operations		15,227		18,239		25,098		26,796		85,360
Income before provision for income taxes		12,936		16,794		22,609		24,222		76,561
Net income		7,871		10,205		13,746		13,887		45,709
Earnings per share:
Basic	$	0.31	$	0.39	$	0.53	$	0.54	$	1.77
Diluted	$	0.30	$	0.39	$	0.53	$	0.53	$	1.75
Dividends declared per share	$	0.245	$	0.245	$	0.245	$	0.245	$	0.98
Shares used in per share calculations:
Basic		25,789		25,912		25,953		25,999		25,914
Diluted		26,230		26,220		26,152		26,206		26,175
Balance Sheet Data
Rental equipment, net	$	775,875	$	795,532	$	817,898	$	825,750	$	825,750
Total assets		1,021,613		1,051,764		1,089,130		1,116,407		1,116,407
Notes payable		288,081		307,000		322,280		322,478		322,478
Shareholders’ equity		401,563		406,439		414,519		424,531		424,531

	2013
	First		Second		Third		Fourth		Year
Operations Data
Rental revenues	$	60,601	$	63,043	$	65,941	$	66,181	$	255,766
Total revenues		88,742		87,156		108,839		94,772		379,509
Gross profit		39,027		40,169		45,189		44,630		169,015
Income from operations		17,389		18,377		22,806		21,678		80,250
Income before provision for income taxes		15,157		16,197		20,679		19,341		71,374
Net income		9,215		9,848		12,573		11,761		43,397
Earnings per share:
Basic	$	0.37	$	0.39	$	0.49	$	0.46	$	1.71
Diluted	$	0.36	$	0.38	$	0.48	$	0.45	$	1.67
Dividends declared per share	$	0.24	$	0.24	$	0.24	$	0.24	$	0.96
Shares used in per share calculations:
Basic		25,003		25,354		25,649		25,717		25,433
Diluted		25,435		25,818		26,095		26,211		25,926
Balance Sheet Data
Rental equipment, net	$	726,100	$	737,636	$	753,810	$	767,010	$	767,010
Total assets		967,131		985,262		1,009,435		1,027,611		1,027,611
Notes payable		281,251		278,875		280,902		290,003		290,003
Shareholders’ equity		372,864		387,779		395,694		401,030		401,030

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2014
Accounting Policies [Abstract]
Organization	Organization McGrath RentCorp and its wholly-owned subsidiaries (the “Company”) is a California corporation organized in 1979. The Company is a diversified business to business rental company with three rental products; relocatable modular buildings, electronic test equipment and liquid and solid containment tanks and boxes. Although the Company’s primary emphasis is on equipment rentals, sales of equipment occur in the normal course of business. The Company is comprised of four business segments: its modular building division (“Mobile Modular”), its electronic test equipment division (“TRS-RenTelco”), its containment solutions for the storage of hazardous and non-hazardous liquids and solids division (“Adler Tanks”) and its classroom manufacturing division selling modular classrooms in California (“Enviroplex”).
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of McGrath RentCorp and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Revenue Recognition	Revenue Recognition Rental revenue from operating leases is recognized on a straight-line basis over the term of the lease. Rental billings for periods extending beyond period end are recorded as deferred income and are recognized when earned. Rental related services revenue is primarily associated with relocatable modular building and liquid and solid containment tanks and boxes leases. For modular building leases, rental related services revenue consists of billings to customers for modifications, delivery, installation, additional site-related work, and dismantle and return delivery. For modular building leases, revenue related to delivery, installation, dismantle and return delivery are an integral part of the negotiated lease agreement with customers and are recognized on a straight-line basis over the term of the lease. For liquid and solid containment solutions, rental related services revenue consists of billings for delivery, removal and cleaning of the tanks and boxes. These revenues are recognized in the period performed. Sales revenue is recognized upon delivery and installation of the equipment to customers. Certain leases are accounted for as sales-type leases. For these leases, sales revenue and the related accounts receivable are recognized upon delivery and installation of the equipment and the unearned interest is recognized over the lease term on a basis which results in a constant rate of return on the unrecovered lease investment. Other revenue is recognized when earned and primarily includes interest income on sales-type leases, rental income on facility rentals and certain logistics services. Sales taxes charged to customers are reported on a net basis and are excluded from revenues and expenses.
Depreciation of Rental Equipment	Depreciation of Rental Equipment Rental equipment is depreciated on a straight-line basis for financial reporting purposes and on an accelerated basis for income tax purposes. The costs of major refurbishment of relocatable modular buildings and portable storage containers are capitalized to the extent the refurbishment significantly adds value to, or extends the life of the equipment. Maintenance and repairs are expensed as incurred.
Costs of Rental Related Services	Costs of Rental Related Services Costs of rental related services are primarily associated with relocatable modular building leases and liquid and solid containment tank and boxes. Modular building leases consist of costs for services to be provided under the negotiated lease agreement for delivery, installation, modifications, skirting, additional site-related work, and dismantle and return delivery. Costs related to these services are recognized on a straight-line basis over the term of the lease. Costs of rental related services associated with liquid and solid containment solutions consists of costs of delivery, removal and cleaning of the tanks and boxes. These costs are recognized in the period the service is performed.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company evaluates the carrying value of rental equipment and identifiable definite lived intangible assets for impairment whenever events or circumstances have occurred that would indicate the carrying amount may not be fully recoverable. A key element in determining the recoverability of long-lived assets is the Company’s outlook as to the future market conditions for its rental equipment. If the carrying amount is not fully recoverable, an impairment loss is recognized to reduce the carrying amount to fair value. The Company determines fair value based upon the condition of the rental equipment and the projected net cash flows from its rental and sale considering current market conditions. Goodwill and identifiable indefinite lived assets are evaluated for potential impairment annually or when circumstances indicate potential impairment may have occurred. Impairment losses, if any, are determined based upon the estimated fair value of the asset. There were no impairments of long-lived assets during the years ended December 31, 2014, 2013 and 2012.
Other Direct Costs of Rental Operations	Other Direct Costs of Rental Operations Other direct costs of rental operations include direct labor, supplies, repairs, insurance, property taxes, license fees and certain modular lease costs charged to customers in the negotiated rental rate, which are recognized on a straight-line basis over the term of the lease.
Cost of Sales	Cost of Sales Cost of sales in the Consolidated Statements of Income includes the carrying value of the equipment sold and all direct costs associated with the sale.
Warranty Reserves	Warranty Reserves Sales of new relocatable modular buildings, portable storage containers, electronic test equipment and related accessories and liquid and solid containment tanks and boxes not manufactured by the Company are typically covered by warranties provided by the manufacturer of the products sold. The Company typically provides limited 90-day warranties for certain sales of used rental equipment and one-year warranties on equipment manufactured by Enviroplex. Although the Company’s policy is to provide reserves for warranties when required for specific circumstances, the Company has not found it necessary to establish such reserves to date as warranty costs have not been significant.
Property, Plant and Equipment	Property, plant and equipment are stated at cost, net of accumulated depreciation. Depreciation is recognized on a straight-line basis for financial reporting purposes, and on an accelerated basis for income tax purposes. Depreciation expenses for property, plant and equipment is included in “Selling and administrative expenses” and “Rental related services” in the Consolidated Statements of Income. Maintenance and repairs are expensed as incurred. Property, plant and equipment depreciation expense was $7.6 million, $7.8 million and $7.8 million for the years ended December 31, 2014, 2013 and 2012, respectively. Construction in progress at December 31, 2014 and 2013 consisted primarily of costs related to acquisition of land and land improvements.
Capitalized Software Costs	Capitalized Software Costs The Company capitalizes certain development costs incurred in connection with its internal use software. Costs incurred in the preliminary stages of development are expensed as incurred. Once an application has reached the development stage, direct internal and external costs are capitalized until the software is substantially complete and ready for its intended use. These costs generally include external direct costs of materials and services consumed in the project and internal costs, such as payroll and benefits of those employees directly associated with the development of the software. Maintenance and training costs are expensed as incurred. The Company also capitalizes costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Capitalized software costs are included in property, plant and equipment. The Company capitalized $0.4 million and $3.5 million in internal use software during the years ended December 31, 2014 and 2013, respectively.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred. Total advertising expenses were $2.4 million, $2.4 million and $2.5 million for the years ended December 31, 2014, 2013 and 2012.
Income Taxes	Income Taxes Income taxes are accounted for using an asset and liability approach. Deferred tax assets and liabilities are recorded for the effect of temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements. Deferred tax assets and deferred tax liabilities are adjusted to the extent necessary to reflect tax rates expected to be in effect when temporary differences reverse. Adjustments may be required to deferred tax assets and deferred tax liabilities due to changes in tax laws and audit adjustments by tax authorities. To the extent adjustments are required in any given period, the adjustments would be included within the tax provision in the Consolidated Statements of Income. The Company has not recorded a valuation allowance for its deferred tax assets. A valuation allowance would be established if, based on the weight of available evidence, management believes that it is more likely than not that some portion or all of a recorded deferred tax asset would not be realized in future periods.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Purchase prices of acquired businesses have been allocated to the assets and liabilities acquired based on the estimated fair values on the respective acquisition dates. Based on these values, the excess purchase prices over the fair value of the net assets acquired were allocated to goodwill and other intangible assets. Intangible assets related to customer relationships are amortized over eleven years. At December 31, 2014 and 2013, goodwill and trade name intangible assets which have indefinite lives totaled $33.5 million and $33.4 million, respectively. The Company assesses potential impairment of its goodwill and intangible assets when there is evidence that events or circumstances have occurred that would indicate the recovery of an asset’s carrying value is unlikely. The Company also assesses potential impairment of its goodwill and intangible assets on an annual basis regardless of whether there is evidence of impairment. If indicators of impairment were to be present in intangible assets used in operations and future discounted cash flows were not expected to be sufficient to recover the assets’ carrying amount, an impairment loss would be charged to expense in the period identified. The amount of an impairment loss would be recognized as the excess of the asset’s carrying value over its fair value. Factors the Company considers important, which may cause impairment include, among others, significant changes in the manner of use of the acquired asset, negative industry or economic trends, and significant underperformance relative to historical or projected operating results. The impairment review of the Company’s goodwill and indefinite lived assets is performed by first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. In the first step, the fair value of the reporting unit is compared to its carrying value to determine if the goodwill and intangible assets are impaired. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, then goodwill and intangible assets are not impaired and no further testing is required. If the carrying value of the net assets assigned to the reporting unit were to exceed its fair value, then the second step is performed in order to determine the implied fair value of the reporting unit’s goodwill and intangible assets and an impairment loss is recorded for an amount equal to the difference between the implied fair value and the carrying value of the goodwill and intangible assets. The Company conducted its annual impairment analysis in the fourth quarter of its fiscal year. The impairment analysis did not result in an impairment charge for the fiscal years ended 2014, 2013 or 2012. Determining the fair value of a reporting unit is judgmental and involves the use of significant estimates and assumptions. The Company based its fair value estimates on assumptions that it believes are reasonable but are uncertain and subject to changes in market conditions.
Earnings Per Share	Earnings Per Share Basic earnings per share (“EPS”) is computed as net income divided by the weighted average number of shares of common stock outstanding for the period. Diluted EPS is computed assuming conversion of all potentially dilutive securities including the dilutive effects of stock options, unvested restricted stock awards and other potentially dilutive securities.
Accounts Receivable and Concentration of Credit Risk	Accounts Receivable and Concentration of Credit Risk The Company’s accounts receivable consist of amounts due from customers for rentals, sales, financed sales and unbilled amounts for the portion of modular building end-of-lease services earned, which were negotiated as part of the lease agreement. Unbilled receivables related to end-of-lease services, which consists of dismantle and return delivery of buildings, were $21.1 million at December 31, 2014 and $18.9 million at December 31, 2013. The Company sells primarily on 30-day terms, individually performs credit evaluation procedures on its customers on each transaction and will require security deposits from its customers when a significant credit risk is identified. The Company records an allowance for doubtful accounts in amounts equal to the estimated losses expected to be incurred in the collection of the accounts receivable. The estimated losses are based on historical collection experience in conjunction with an evaluation of the current status of the existing accounts. Customer accounts are written off against the allowance for doubtful accounts when an account is determined to be uncollectable. The allowance for doubtful accounts activity was as follows: Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of trade accounts receivable. From time to time, the Company maintains cash balances in excess of the Federal Deposit Insurance Corporation limits.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company believes that the carrying amounts for cash, accounts receivable, accounts payable and notes payable approximate their fair values except for fixed rate debt included in notes payable which has an estimated fair value of $122.9 million and $104.6 million compared to the recorded value of $120.0 million and $100.0 million as of December 31, 2014 and 2013, respectively. The estimates of fair value of the Company’s fixed rate debt are based on the borrowing rates currently available to the Company for bank loans with similar terms and average maturities.
Foreign Currency Transactions and Translation	Foreign Currency Transactions and Translation The Company’s Canadian subsidiary, TRS-RenTelco Inc., a British Columbia corporation (“TRS-Canada”), functions as a branch sales office for TRS-RenTelco in Canada. The functional currency for TRS-Canada is the U.S. dollar. Foreign currency transaction gains and losses of TRS-Canada are reported in the results of operations in the period in which they occur. The Company’s Indian subsidiary, TRS-RenTelco India Private Limited (“TRS-India”), functions as a rental and sales office for TRS-RenTelco in India. The functional currency for TRS-India is the Indian Rupee. All assets and liabilities of TRS-India are translated into U.S. dollars at period-end exchange rates and all income statement amounts are translated at the average exchange rate for each month within the year. Currently, the Company does not use derivative instruments to hedge its economic exposure with respect to assets, liabilities and firm commitments as the foreign currency transactions and risks to date have not been significant.
Share-Based Compensation	Share-Based Compensation The Company measures and recognizes the compensation expense for all share-based awards made to employees and directors, including stock options, stock appreciation rights (“SARs”) and restricted stock units (“RSUs”), based upon estimated fair values. The fair value of stock options and SARs is estimated on the date of grant using the Black-Scholes option pricing model and for RSUs based upon the fair market value of the underlying shares of common stock as of the date of grant. The Company recognizes share-based compensation cost ratably on a straight-line basis over the requisite service period, which generally equals the vesting period. For performance-based RSUs, compensation costs are recognized when vesting conditions are met. In addition, the Company estimates the probable number of shares of common stock that will be earned and the corresponding compensation cost until the achievement of the performance goal is known. The Company records share-based compensation costs in “Selling and administrative expenses” in the Consolidated Statements of Income. The Company recognizes a benefit from share-based compensation in the Consolidated Statements of Shareholders’ Equity if an incremental tax benefit is realized. Further information regarding share-based compensation can be found in “Note 5—Benefit Plans”.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions in determining reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during each period presented. Actual results could differ from those estimates. The most significant estimates included in the financial statements are the future cash flows and fair values used to determine the recoverability of the rental equipment and identifiable definite lived intangible assets carrying value, the various assets’ useful lives and residual values, and the allowance for doubtful accounts.
Reclassifications	Reclassifications In order to conform to current year presentation, certain amounts on the Consolidated Balance Sheets were reclassified from “Deferred income taxes, net” to “Prepaid and other assets”, on the Consolidated Statements of Income certain amounts were reclassified from “Other revenues” to “Foreign currency exchange gain (loss)” and on the Consolidated Statements of Cash Flows certain amounts were reclassified from “Proceeds from the exercise of stock options” to “Taxes paid related to net share settlement of stock awards”. These reclassifications had no impact on net income, earnings per share or operating cash flows.
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. The objective of this guidance is to establish the principles to report useful information to users of financial statements about the nature, timing and uncertainty of revenue from contracts with customers. The guidance in the update is effective for the interim and annual reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of the adoption of this accounting guidance on its consolidated financial statements. In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Term of Award Provides That a Performance Target Could Be Achieved after the Requisite Service Period. This update requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The guidance in the update is effective for the interim and annual reporting periods beginning after December 15, 2015. The Company does not expect the adoption of this accounting guidance to have a significant impact on its consolidated financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as Going Concern. This ASU is intended to define management’s responsibilities to evaluate whether there is substantial doubt about an organization’s ability to continue as going concern and provide related footnote disclosures. The amendments in this ASU will be effective for the Company in the fourth quarter of fiscal 2016, with early adoption permitted. The Company does not expect the adoption of this accounting guidance to have a significant impact on its consolidated financial statements.
Income Tax Position	The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority.
Segment Reporting	FASB guidelines establish annual and interim reporting standards for an enterprise’s operating segments and related disclosures about its products, services, geographic areas and major customers. In accordance with these guidelines the Company’s four reportable segments are Mobile Modular, TRS-RenTelco, Adler Tanks and Enviroplex. Management focuses on several key measures to evaluate and assess each segment’s performance including rental revenue growth, gross margin, and income before provision for income taxes. As separate corporate entities, Adler Tanks and Enviroplex revenues and expenses are separately maintained from Mobile Modular and TRS-RenTelco. Excluding interest expense, allocations of revenue and expense not directly associated with one of these segments are generally allocated to Mobile Modular, TRS-RenTelco and Adler Tanks, based on their pro-rata share of direct revenues. Interest expense is allocated amongst Mobile Modular, TRS-RenTelco and Adler Tanks based on their pro-rata share of average rental equipment at cost, goodwill, intangible assets, accounts receivable, deferred income and customer security deposits. The Company does not report total assets by business segment.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Estimated Useful Lives and Residual Values of Company's Rental Equipment

The estimated useful lives and residual values of the Company’s rental equipment used for financial reporting purposes are as follows:


Relocatable modular buildings		18 years, 50% residual value
Relocatable modular accessories		3 to 18 years, no residual value
Portable storage containers		25 years, 62.5% residual value
Electronic test equipment and accessories		1 to 8 years, no residual value
Liquid and solid containment tanks and boxes and accessories		10 to 20 years, no residual value

Property, Plant and Equipment

Property, plant and equipment consist of the following:


(dollar amounts in thousands)	Estimated useful life in years		December 31,
(dollar amounts in thousands)	Estimated useful life in years		2014			2013
Land		Indefinite	$	38,455		$	37,354
Land improvements		20 – 50		39,715			39,068
Buildings		30		21,486			21,151
Furniture, office and computer equipment		3 – 10		32,544			30,761
Machinery and service equipment		5 – 20		24,454			20,106

				156,654			148,440
Less accumulated depreciation				(53,503	)		(47,058	)

				103,151			101,382
Construction in progress				5,477			3,805

			$	108,628		$	105,187

Weighted-Average Common Stock Used to Calculate Basic and Diluted Earnings per Share

The table below presents the weighted-average common stock used to calculate basic and diluted earnings per share:


(in thousands)	Year Ended December 31,
	2014		2013		2012
Weighted-average common stock for calculating basic earnings per share		25,914		25,433		24,759
Effect of potentially dilutive securities from equity-based compensation		261		493		397

Weighted-average common stock for calculating diluted earnings per share		26,175		25,926		25,156

Securities Not Included in Computation of Diluted Earnings Per Share

The following securities were not included in the computation of diluted earnings per share as their effect would have been anti-dilutive:


(in thousands)	Year Ended December 31,
	2014		2013		2012
Options to purchase common stock		9		20		1,049

Summary of Allowance for Doubtful Accounts Activity

The allowance for doubtful accounts activity was as follows:


(in thousands)	2014			2013
Beginning balance, January 1	$	2,007		$	3,000
Provision for doubtful accounts		1,825			2,144
Write-offs, net of recoveries		(1,794	)		(3,137	)

Ending balance, December 31	$	2,038		$	2,007

Financed Lease Receivables (Tables)

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Minimum Lease Payments Receivable and Net Investment Included in Accounts Receivable for Leases

The minimum lease payments receivable and the net investment included in accounts receivable for such leases are as follows:


(in thousands)	December 31,
	2014			2013
Gross minimum lease payments receivable	$	3,489		$	5,462
Less—unearned interest		(188	)		(314	)

Net investment in sales type lease receivables	$	3,301		$	5,148

Future Minimum Lease Payments under Non-Cancelable Sales-Type Leases

As of December 31, 2014, the future minimum lease payments under non-cancelable sales-type leases to be received in 2015 and thereafter are as follows:


(in thousands)
Year Ended December 31,
2015	$	2,828
2016		568
2017		93
2018		—

Notes Payable (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Components of Notes Payable

Notes payable consists of the following:


(in thousands)	December 31,
	2014		2013
Unsecured revolving lines of credit	$	202,478	$	190,003
4.03% senior notes due in 2018		80,000		100,000
3.68% senior notes due in 2021		40,000		—

	$	322,478	$	290,003

Schedule of Future Minimum Payments under Unsecured Revolving Lines of Credit and 4.03% Senior Notes and 3.68% Senior Notes

As of December 31, 2014, the future minimum payments under the unsecured revolving lines of credit, 4.03% senior notes due in 2018 and 3.68% senior notes due in 2021 are as follows:


(in thousands)
Year Ended December 31,
2015	$	20,000
2016		20,000
2017		222,478
2018		20,000
2019 and thereafter		40,000

	$	322,478

Schedule of Information Related to Lines of Credit

The following information relates to the lines of credit for each of the following periods:


(dollar amounts in thousands)	Year Ended December 31,
	2014			2013
Maximum amount outstanding	$	208,894		$	202,000
Average amount outstanding	$	191,248		$	187,644
Weighted average interest rate, during the period		2.41	%		2.45	%
Prime interest rate, end of period		3.25	%		3.25	%

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Income Before Provision For Income Taxes

Income before provision for income taxes consisted of the following:


(in thousands)	Year Ended December 31,
	2014			2013			2012
U.S.	$	76,848		$	71,678		$	72,555
Foreign		(287	)		(304	)		312

	$	76,561		$	71,374		$	72,867

Provision for Income Taxes

The provision for income taxes consisted of the following:


(in thousands)	Year Ended December 31,
	2014			2013			2012
Current:
U.S. Federal	$	7,494		$	1,188		$	1,634
State		2,139			1,803			653
Foreign		1,572			2,217			2,599

		11,205			5,208			4,886

Deferred:
U.S. Federal		17,986			21,067			20,952
State		1,927			1,818			2,252
Foreign		(266	)		(116	)		—

		19,647			22,769			23,204

Total	$	30,852		$	27,977		$	28,090

Reconciliation of U.S. Federal Statutory Tax Rate to Company's Effective Tax Rate

The reconciliation of the U.S. federal statutory tax rate to the Company’s effective tax rate is as follows:


	Year Ended December 31,
	2014			2013			2012
U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of federal benefit		4.1			4.1			4.2
Other		1.2			0.1			(0.6	)

		40.3	%		39.2	%		38.6	%

Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities


(in thousands)	December 31,
	2014		2013
Deferred tax liabilities:
Accelerated depreciation	$	272,496	$	257,537
Prepaid costs currently deductible		6,358		4,794
Other		4,404		3,242

Total deferred tax liabilities		283,258		265,573

Deferred tax assets:
Accrued costs not yet deductible		7,463		6,638
Allowance for doubtful accounts		788		775
Net operating loss carry forwards and credits		302		2,736
Deferred revenues		1,132		305
Share-based compensation		4,671		5,862

Total deferred tax assets		14,356		16,316

Deferred income taxes, net	$	268,902	$	249,257

Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Company's Option Activity

A summary of the Company’s option activity and related information for the three years ended December 31, 2014 is as follows:


	Number of options			Weighted- average price		Weighted- average remaining contractual term (in years)		Aggregate intrinsic value (in millions)
Balance at December 31, 2011		3,086,019		$	23.52
Options granted		128,500			29.63
Options exercised		(327,498	)		17.95
Options cancelled/forfeited/expired		(48,468	)		27.63

Balance at December 31, 2012		2,838,553			24.37
Options granted		192,800			29.14
Options exercised		(1,237,341	)		24.71
Options cancelled/forfeited/expired		(21,950	)		25.20

Balance at December 31, 2013		1,772,062			24.68
Options granted		203,600			32.79
Options exercised		(612,682	)		21.55
Options cancelled/forfeited/expired		(19,220	)		30.35

Balance at December 31, 2014		1,343,760		$	27.25		2.97	$	11.6

Exercisable at December 31, 2014		883,605		$	25.37		1.80	$	9.3
Expected to vest after December 31, 2014		414,140		$	30.68		5.22	$	2.1

Options Outstanding and Options Exercisable by Exercise Price with Weighted-Average Remaining Contractual Life for Options Outstanding and Weighted-Average Exercise Price


	Options Outstanding						Options Exercisable
Exercise price	Number outstanding at December 31, 2014		Weighted- average remaining contractual life (Years)		Weighted- average grant date value		Number exercisable at December 31, 2014		Weighted- average grant date value
$15–20		149,700		1.17	$	15.62		149,700	$	15.62
20–25		229,225		1.79		23.19		212,040		23.18
25–30		653,435		2.56		29.12		510,465		29.24
30–35		302,000		5.56		32.35		10,400		32.40
35–40		9,400		5.96		37.83		1,000		38.89

$15–40		1,343,760		2.97	$	27.25		883,605	$	25.37

Schedule of Weighted-Average Assumptions Used to Determine Fair Value of Option Granted

The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model using the following weighted-average assumptions:


	Year Ended December 31,
	2014			2013			2012
Expected term (in years)		5.0			5.0			5.0
Expected volatility		40.5	%		50.3	%		52.1	%
Expected dividend yields		3.0	%		3.3	%		3.2	%
Risk-free interest rates		1.5	%		0.8	%		0.8	%

Summary of Company's Restricted Stock Units Activity

The following table summarizes the activity of the Company’s RSUs, which includes service-based and performance-based awards, for the three years ended December 31, 2014:


	Number of shares			Weighted- average grant Date fair value		Aggregate intrinsic value (in millions)
Balance at December 31, 2011		187,810		$	26.33
RSUs granted		109,200			31.37
RSUs vested		(34,190	)		27.85
RSUs cancelled/forfeited/expired		—			—

Balance at December 31, 2012		262,820			28.22
RSUs granted		150,300			26.89
RSUs vested		(87,840	)		24.98
RSUs cancelled/forfeited/expired		(4,300	)		29.24

Balance at December 31, 2013		320,980			28.47
RSUs granted		118,864			30.85
RSUs vested		(120,721	)		27.30
RSUs cancelled/forfeited/expired		(7,540	)		30.34

Balance at December 31, 2014		311,583		$	29.78	$	11.2

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Minimum Payments under Leases, Exclusive of Property Taxes and Insurance

Minimum payments under these leases, exclusive of property taxes and insurance, are as follows:


(in thousands)

Year Ended December 31,
2015	$	1,311
2016		910
2017		686
2018		627
Thereafter		—

	$	3,534

Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

Intangible assets consist of the following:


(dollar amounts in thousands)	Estimated useful life (In years)		December 31,
	Estimated useful life (In years)		2014			2013
Trade name		Indefinite	$	5,700		$	5,700
Customer relationships		11		9,611			9,100

				15,311			14,800
Less accumulated amortization				(4,975	)		(4,138	)

			$	10,336		$	10,662

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Summarized Financial Information for Company's Reportable Segments

Summarized financial information for the years ended December 31, 2014, 2013 and 2012, for the Company’s reportable segments is shown in the following tables:


Segment Data	Mobile Modular			TRS-RenTelco			Adler Tanks			Enviroplex¹			Consolidated
(dollar amounts in thousands)
Year Ended December 31,
2014
Rental revenues	$	96,457		$	99,020		$	74,098		$	—		$	269,575
Rental related services revenues		35,263			3,331			25,538			—			64,132
Sales and other revenues		29,855			25,951			1,152			17,457			74,415
Total revenues		161,575			128,302			100,788			17,457			408,122
Depreciation of rental equipment		16,536			40,935			15,207			—			72,678
Gross profit		63,455			60,249			53,452			5,063			182,219
Interest expense (income) allocation		4,768			2,075			2,618			(181	)		9,280
Income before provision for income taxes		16,959			34,383			23,605			1,614			76,561
Rental equipment acquisitions		82,792			45,158			20,652			—			148,602
Accounts receivable, net (period end)		46,797			28,849			21,031			4,617			101,294
Rental equipment, at cost (period end)		664,340			261,995			303,303			—			1,229,638
Rental equipment, net book value (period end)		473,960			105,729			246,061			—			825,750
Utilization (period end)²		75.0	%		59.8	%		63.9	%
Average utilization²		72.3	%		60.4	%		62.9	%


Segment Data (Continued)		Mobile Modular			TRS-RenTelco			Adler Tanks			Enviroplex¹			Consolidated
(dollar amounts in thousands)
Year Ended December 31,
2013
Rental revenues	$	82,503		$	102,101		$	71,162		$	—		$	255,766
Rental related services revenues		28,891			3,095			21,162			—			53,148
Sales and other revenues		21,267			29,857			1,616			17,855			70,595
Total revenues		132,661			135,053			93,940			17,855			379,509
Depreciation of rental equipment		14,459			39,953			13,796			—			68,208
Gross profit		50,423			63,520			51,076			3,996			169,015
Interest expense (income) allocation		4,318			2,156			2,419			(206	)		8,687
Income before provision for income taxes		9,617			36,633			24,013			1,111			71,374
Rental equipment acquisitions		52,953			52,625			31,023			—			136,601
Accounts receivable, net (period end)		37,163			27,328			21,915			1,244			87,650
Rental equipment, at cost (period end)		592,391			267,772			284,005			—			1,144,168
Rental equipment, net book value (period end)		415,366			109,988			241,656			—			767,010
Utilization (period end)²		70.7	%		58.2	%		57.7	%
Average utilization²		68.3	%		62.7	%		64.2	%

2012
Rental revenues	$	79,518		$	101,645		$	67,281		$	—		$	248,444
Rental related services revenues		25,775			3,673			17,472			—			46,920
Sales and other revenues		14,474			27,820			2,558			23,823			68,675
Total revenues		119,767			133,138			87,311			23,823			364,039
Depreciation of rental equipment		13,942			38,174			11,703			—			63,819
Gross profit		52,022			62,048			51,157			3,032			168,259
Interest expense (income) allocation		4,547			2,384			2,350			(132	)		9,149
Income (loss) before provision for income taxes		13,443			33,631			26,706			(913	)		72,867
Rental equipment acquisitions		21,042			51,793			55,919			—			128,754
Accounts receivable, net (period end)		39,066			24,654			24,323			4,213			92,256
Rental equipment, at cost (period end)		551,101			266,934			254,810			—			1,072,845
Rental equipment, net book value (period end)		384,813			107,999			226,041			—			718,853
Utilization (period end)²		66.7	%		64.1	%		67.5	%
Average utilization²		66.4	%		65.8	%		71.5	%

Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

Quarterly financial information for each of the two years ended December 31, 2014 is summarized below:


(in thousands, except per share amounts)	2014
	First		Second		Third		Fourth		Year
Operations Data
Rental revenues	$	62,430	$	65,809	$	69,642	$	71,694	$	269,575
Total revenues		87,560		95,745		113,025		111,792		408,122
Gross profit		38,638		42,079		49,298		52,204		182,219
Income from operations		15,227		18,239		25,098		26,796		85,360
Income before provision for income taxes		12,936		16,794		22,609		24,222		76,561
Net income		7,871		10,205		13,746		13,887		45,709
Earnings per share:
Basic	$	0.31	$	0.39	$	0.53	$	0.54	$	1.77
Diluted	$	0.30	$	0.39	$	0.53	$	0.53	$	1.75
Dividends declared per share	$	0.245	$	0.245	$	0.245	$	0.245	$	0.98
Shares used in per share calculations:
Basic		25,789		25,912		25,953		25,999		25,914
Diluted		26,230		26,220		26,152		26,206		26,175
Balance Sheet Data
Rental equipment, net	$	775,875	$	795,532	$	817,898	$	825,750	$	825,750
Total assets		1,021,613		1,051,764		1,089,130		1,116,407		1,116,407
Notes payable		288,081		307,000		322,280		322,478		322,478
Shareholders’ equity		401,563		406,439		414,519		424,531		424,531

	2013
	First		Second		Third		Fourth		Year
Operations Data
Rental revenues	$	60,601	$	63,043	$	65,941	$	66,181	$	255,766
Total revenues		88,742		87,156		108,839		94,772		379,509
Gross profit		39,027		40,169		45,189		44,630		169,015
Income from operations		17,389		18,377		22,806		21,678		80,250
Income before provision for income taxes		15,157		16,197		20,679		19,341		71,374
Net income		9,215		9,848		12,573		11,761		43,397
Earnings per share:
Basic	$	0.37	$	0.39	$	0.49	$	0.46	$	1.71
Diluted	$	0.36	$	0.38	$	0.48	$	0.45	$	1.67
Dividends declared per share	$	0.24	$	0.24	$	0.24	$	0.24	$	0.96
Shares used in per share calculations:
Basic		25,003		25,354		25,649		25,717		25,433
Diluted		25,435		25,818		26,095		26,211		25,926
Balance Sheet Data
Rental equipment, net	$	726,100	$	737,636	$	753,810	$	767,010	$	767,010
Total assets		967,131		985,262		1,009,435		1,027,611		1,027,611
Notes payable		281,251		278,875		280,902		290,003		290,003
Shareholders’ equity		372,864		387,779		395,694		401,030		401,030

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($) Segment Product	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Accounting Policies [Abstract]
Number of products \| Product	3
Number of reportable segments \| Segment	4
Impairments of long-lived assets	$ 0	$ 0	$ 0
Period for warranties for rental equipment	90 days
Period for warranties for equipment manufactured	1 year
Property, plant and equipment depreciation expenses	$ 7,600,000	7,800,000	7,800,000
Capitalized in internal use of software	400,000	3,500,000
Total advertising expenses	2,400,000	2,400,000	2,500,000
Deferred tax assets, valuation allowance	$ 0
Estimated useful life (In years), Customer relationships	11 years
Goodwill and trade name intangible assets	$ 33,500,000	33,400,000
Goodwill and intangible assets impairment charge	0	0	$ 0
Unbilled receivables related to end-of-lease services	$ 21,100,000	18,900,000
Period for credit risk identified	30 days
Estimated fair value notes payable	$ 122,900,000	104,600,000
Recorded fair value of notes payable	$ 120,000,000	$ 100,000,000

Summary of Significant Accounting Policies - Estimated Useful Lives and Residual Values of Company's Rental Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Relocatable modular buildings [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	18 years
Percentage residual value property subject to or available for operating lease	50.00%
Relocatable modular accessories [Member]
Property, Plant and Equipment [Line Items]
Percentage residual value property subject to or available for operating lease	0.00%
Portable storage containers [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	25 years
Percentage residual value property subject to or available for operating lease	62.50%
Electronic test equipment and accessories [Member]
Property, Plant and Equipment [Line Items]
Percentage residual value property subject to or available for operating lease	0.00%
Liquid and solid containment tanks and boxes and accessories [Member]
Property, Plant and Equipment [Line Items]
Percentage residual value property subject to or available for operating lease	0.00%
Minimum [Member] \| Relocatable modular accessories [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	3 years
Minimum [Member] \| Electronic test equipment and accessories [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	1 year
Minimum [Member] \| Liquid and solid containment tanks and boxes and accessories [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	10 years
Maximum [Member] \| Relocatable modular accessories [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	18 years
Maximum [Member] \| Electronic test equipment and accessories [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	8 years
Maximum [Member] \| Liquid and solid containment tanks and boxes and accessories [Member]
Property, Plant and Equipment [Line Items]
Property subject to or available for operating lease useful life	20 years

Summary of Significant Accounting Policies - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 156,654	$ 148,440
Less Accumulated Depreciation	(53,503)	(47,058)
Property plant and equipment net excluding capitalized cost	103,151	101,382
Construction In Progress	5,477	3,805
Property, Plant and Equipment, net	108,628	105,187
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 38,455	37,354
Estimated useful life	Indefinite
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 39,715	39,068
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 21,486	21,151
Estimated useful life	30 years
Furniture, Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 32,544	30,761
Machinery and Service Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 24,454	$ 20,106
Minimum [Member] \| Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Minimum [Member] \| Furniture, Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum [Member] \| Machinery and Service Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Maximum [Member] \| Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Maximum [Member] \| Furniture, Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Maximum [Member] \| Machinery and Service Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years

Summary of Significant Accounting Policies - Weighted-Average Common Stock Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted-average common stock for calculating basic earnings per share	25,999	25,953	25,912	25,789	25,717	25,649	25,354	25,003	25,914	25,433	24,759
Effect of potentially dilutive securities from equity-based compensation									261	493	397
Weighted-average common stock for calculating diluted earnings per share	26,206	26,152	26,220	26,230	26,211	26,095	25,818	25,435	26,175	25,926	25,156

Summary of Significant Accounting Policies - Securities Not Included in Computation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Options to purchase common stock	9	20	1,049

Summary of Significant Accounting Policies - Summary of Allowance for Doubtful Accounts Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Allowance for doubtful accounts, Beginning Balance	$ 2,007	$ 3,000
Provision for doubtful accounts	1,825	2,144	$ 4,263
Write-offs, net of recoveries	(1,794)	(3,137)
Allowance for doubtful accounts, Ending Balance	$ 2,038	$ 2,007	$ 3,000

Financed Lease Receivables - Minimum Lease Payments Receivable and Net Investment Included in Accounts Receivable for Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Minimum lease payments receivable and net investment included in accounts receivable for leases
Gross minimum lease payments receivable	$ 3,489	$ 5,462
Less-unearned interest	(188)	(314)
Net investment in sales type lease receivables	$ 3,301	$ 5,148

Financed Lease Receivables - Future Minimum Lease Payments under Non-Cancelable Sales-Type Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Future minimum lease payments under non-cancelable sales-type leases
2015	$ 2,828
2016	568
2017	93
2018	0
Total minimum future lease payments	$ 3,489	$ 5,462

Notes Payable - Components of Notes Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Notes payable	$ 322,478	$ 322,280	$ 307,000	$ 288,081	$ 290,003	$ 280,902	$ 278,875	$ 281,251
Unsecured Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Notes payable	202,478				190,003
Senior Notes [Member] \| 4.03% senior notes due in 2018 [Member]
Debt Instrument [Line Items]
Notes payable	80,000				$ 100,000
Senior Notes [Member] \| 3.68% senior notes due in 2021 [Member]
Debt Instrument [Line Items]
Notes payable	$ 40,000

Notes Payable - Components of Notes Payable (Parenthetical) (Detail) - Senior Notes [Member]	12 Months Ended
	Dec. 31, 2014	Mar. 17, 2014	Apr. 21, 2011
4.03% senior notes due in 2018 [Member]
Debt Instrument [Line Items]
Senior Notes, interest rate	4.03%		4.03%
Senior Notes, year of maturity	2018
3.68% senior notes due in 2021 [Member]
Debt Instrument [Line Items]
Senior Notes, interest rate	3.68%	3.68%
Senior Notes, year of maturity	2021

Notes Payable - Schedule of Future Minimum Payments under Unsecured Revolving Lines of Credit and 4.03% Senior Notes and 3.68% Senior Notes (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Notes payable	$ 322,478	$ 322,280	$ 307,000	$ 288,081	$ 290,003	$ 280,902	$ 278,875	$ 281,251
Notes Payable to Banks and Others [Member]
Debt Instrument [Line Items]
2015	20,000
2016	20,000
2017	222,478
2018	20,000
2019 and thereafter	40,000
Notes payable	$ 322,478

Notes Payable - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Mar. 17, 2014	Dec. 31, 2013	Dec. 31, 2014	Jun. 30, 2012	Apr. 21, 2011
Debt Instrument [Line Items]
Consolidated Fixed Charge Coverage Ratio			2.50
Consolidated Fixed Charge Coverage Ratio, actual			4.02
Consolidated Leverage Ratio			2.75
Consolidated Leverage Ratio, actual			1.89
Line of credit facility covenants tangible net worth description			Permit Tangible Net Worth, calculated as of the last day of each fiscal quarter, to be less than the sum of (i) $229.0 million, plus (ii) 25% of net income for such fiscal quarter subsequent to December 31, 2010, plus (iii) 90% of the net cash proceeds from the issuance of the Company's capital stock after December 31, 2010.
Tangible Net Worth sum			$ 294,200,000
Consolidated Net Income			25.00%
Percentage of net cash proceeds from issuance of capital stock			90.00%
Actual tangible net worth			$ 386,400,000
Minimum [Member]
Debt Instrument [Line Items]
Tangible Net Worth sum			$ 229,000,000
Senior Notes [Member] \| 4.03% senior notes due in 2018 [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 100,000,000
Senior notes interest rate			4.03%		4.03%
Debt instrument, payment terms			Interest on these notes is due semi-annually in arrears and the principal is due in five equal annual installments, with the first payment due on April 21, 2014.
Debt instrument, maturity date			Apr. 21, 2018
Debt instrument, date of first required payment			Apr. 21, 2014
Senior notes principal balance outstanding		$ 100,000,000	$ 80,000,000
Senior Notes [Member] \| 4.03% senior notes due in 2018 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, maturity period			12 years
Debt instrument, average life			10 years
Senior Notes [Member] \| 3.68% senior notes due in 2021 [Member]
Debt Instrument [Line Items]
Senior notes interest rate	3.68%		3.68%
Debt instrument, maturity date	Mar. 17, 2021
Proceeds from issuance of senior notes	$ 40,000,000
Senior notes description	The Series B Senior Notes are an unsecured obligation of the Company and bear interest at a rate of 3.68% per annum and mature on March 17, 2021. Interest on the Series B Senior Notes is payable semi-annually beginning on September 17, 2014 and continuing thereafter on March 17 and September 17 of each year until maturity.
Senior notes interest payment	Semi-annually
Unsecured revolving credit facility before Amendment [Member]
Debt Instrument [Line Items]
Credit facility, maximum			$ 350,000,000
Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, maturity period			5 years
Revolving credit facility, maturity date			Jun. 15, 2017
Credit facility, maximum			$ 420,000,000
Revolving credit facility, available maximum borrowing capacity			450,000,000
Additional commitments			30,000,000
Amount outstanding		$ 186,000,000	$ 200,000,000
Consolidated Fixed Charge Coverage Ratio			2.50
Consolidated Fixed Charge Coverage Ratio, actual			4.02
Consolidated Leverage Ratio			1.89
Consolidated Leverage Ratio, actual			2.75
Line of credit facility covenants tangible net worth description			Permit Tangible Net Worth as of the end of any fiscal quarter of the Company to be less than the sum of (i) $246.1 million plus (ii) 25% of the Company's Consolidated Net Income (as defined in the Amended Credit Facility) (but only if a positive number) for each fiscal quarter ended subsequent to December 31, 2011
Tangible Net Worth sum			$ 294,200,000
Consolidated Net Income			25.00%
Percentage of net cash proceeds from issuance of capital stock			90.00%
Actual tangible net worth			$ 386,400,000
Debt instrument description of variable rate basis			(i) LIBOR plus a defined margin, or (ii) the Agent bank’s prime rate (“base rate”) plus a margin. The applicable margin for each type of loan is measured based upon the Consolidated Leverage Ratio at the end of the prior fiscal quarter and ranges from 1.00% to 1.75% for LIBOR loans and 0% to 0.75% for base rate loans. In addition, the Company pays an unused commitment fee for the portion of the $420.0 million credit facility that is not used. These fees are based upon the Consolidated Leverage Ratio and range from 0.15% to 0.30%. As of December 31, 2014 and 2013, the applicable margins were 1.50% for LIBOR based loans, 0.50% for base rate loans and 0.25% for unused fees. Amounts borrowed under the Sweep Service Facility are based upon the Union Bank, N.A. base rate plus an applicable margin and an unused commitment fee for the portion of the $10.0 million facility not used.
Unused commitment fees			$ 420,000,000
Amended Credit Facility [Member] \| Unused Fees [Member]
Debt Instrument [Line Items]
Debt instrument interest rate at period end		0.25%	0.25%
Amended Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Tangible Net Worth sum			$ 246,100,000
Leverage ratio			0.15%
Amended Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio			0.30%
Amended Credit Facility [Member] \| LIBOR Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate at period end		1.50%	1.50%
Amended Credit Facility [Member] \| LIBOR Loans [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio		1.00%
Amended Credit Facility [Member] \| LIBOR Loans [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio		1.75%
Amended Credit Facility [Member] \| Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate at period end		0.50%	0.50%
Amended Credit Facility [Member] \| Base Rate Loans [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio		0.00%
Amended Credit Facility [Member] \| Base Rate Loans [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio		0.75%
Amended Credit Facility [Member] \| Sweep Service Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum			$ 430,000,000
Revolving credit facility, available maximum borrowing capacity			227,500,000
Amount outstanding			202,500,000
Unused commitment fees			10,000,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum			25,000,000
Letters of Credit [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum				$ 5,000,000
Letters of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum				$ 10,000,000
Letters of Credit [Member] \| Sweep Service Facility [Member]
Debt Instrument [Line Items]
Amount outstanding		$ 4,000,000	2,500,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Credit facility, maximum			$ 10,000,000

Notes Payable - Schedule of Information Related to Lines of Credit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Maximum amount outstanding	$ 208,894	$ 202,000
Average amount outstanding	$ 191,248	$ 187,644
Weighted average interest rate, during the period	2.41%	2.45%
Prime interest rate, end of period	3.25%	3.25%

Income Taxes - Schedule of Income Before Provision For Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
U.S.									$ 76,848	$ 71,678	$ 72,555
Foreign									(287)	(304)	312
Income before provision for income taxes	$ 24,222	$ 22,609	$ 16,794	$ 12,936	$ 19,341	$ 20,679	$ 16,197	$ 15,157	$ 76,561	$ 71,374	$ 72,867

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
U.S. Federal	$ 7,494	$ 1,188	$ 1,634
State	2,139	1,803	653
Foreign	1,572	2,217	2,599
Current income tax expense (benefit)	11,205	5,208	4,886
Deferred:
U.S. Federal	17,986	21,067	20,952
State	1,927	1,818	2,252
Foreign	(266)	(116)
Deferred income tax expense (benefit)	19,647	22,769	23,204
Total	$ 30,852	$ 27,977	$ 28,090

Income Taxes - Reconciliation of U.S. Federal Statutory Tax Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	4.10%	4.10%	4.20%
Other	1.20%	0.10%	(0.60%)
Effective Income Tax Rate	40.30%	39.20%	38.60%

Income Taxes - Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Deferred tax liabilities:
Accelerated depreciation	$ 272,496	$ 257,537
Prepaid costs currently deductible	6,358	4,794
Other	4,404	3,242
Total deferred tax liabilities	283,258	265,573
Deferred tax assets:
Accrued costs not yet deductible	7,463	6,638
Allowance for doubtful accounts	788	775
Net operating loss carry forwards and credits	302	2,736
Deferred revenues	1,132	305
Share-based compensation	4,671	5,862
Total deferred tax assets	14,356	16,316
Deferred income taxes, net	$ 268,902	$ 249,257

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Excess tax benefit obtained by company	$ 1,800,000	$ 1,300,000	$ 1,000,000
Undistributed earnings of foreign subsidiaries	$ 1,600,000	1,200,000
Likelihood percentage of being realized upon ultimate settlement with the relevant tax authority	50.00%
Unrecognized tax benefits	$ 0	0
Changes in unrecognized benefits	0	0	$ 0
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Company's foreign net operating losses for tax purposes	$ 1,000,000
Foreign net operating loss carry forwards, expiration description	Begin to expire in 2022
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
State and foreign tax credit carry forwards		$ 2,600,000

Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2011	Jun. 06, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized			1,500,000	815,000
Share-based compensation expense	$ 3,854,000	$ 3,680,000	$ 3,840,000
Tax benefit related to share-based compensation expense	1,500,000	1,400,000	1,500,000
Capitalized share-based compensation expense	0	0	0
Amount of reduction in net income due to share-based compensation expense	$ 2,300,000	$ 2,200,000	$ 2,400,000
Amount of reduction in diluted earning per share to share-based compensation expense	$ 0.09	$ 0.09	$ 0.09
Stock option plans remain outstanding	1,343,760	1,772,062	2,838,553		3,086,019
Aggregate intrinsic value of options exercised and sold	$ 9,300,000
Weighted average grant date fair value	$ 9.17	$ 9.87	$ 10.28
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock remained available for grants of awards						1,875,000
Minimum rate of exercise price granted	100.00%
Employee Stock Ownership and 401(k) Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan merged assets	$ 16,400,000
Dividends deducted	300,000
Tax benefit from dividends	$ 100,000
Shares outstanding, employee stock ownership plan	328,400
Percentage of total common shares outstanding	2.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized	1,205,444
Stock options granted	6,821,000
Stock options, exercise prices lower	$ 3.47
Stock options, exercise prices upper	$ 38.89
Purchase of shares	4,583,868
Stock option shares terminated	887,872
Stock option plans remain outstanding	1,343,760
Stock options vesting period	5 years
Options issued to non-employee advisors	0
Stock options outstanding, exercise prices lower	$ 15.62
Stock options outstanding, exercise prices upper	$ 38.89
Aggregate intrinsic value of options exercised and sold	$ 8,400,000	$ 11,500,000	$ 3,900,000
Total unrecognized compensation cost	$ 3,500,000
Expected recognition period of unrecognized compensation expense	2 years
Performance-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	5 years
Percentage of vesting annually at anniversary	20.00%
Number of RSU's expected to vest	137,036
Performance-based RSUs [Member] \| Vesting after three years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting RSUs	60.00%
Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's expected to vest	18,340
Number of forfeitures expected	0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected recognition period of unrecognized compensation expense	2 years 6 months
Number of forfeitures expected	7,540	4,300
Stock-based compensation expense for restricted stock	$ 2,300,000	$ 2,000,000	$ 1,800,000
Total unrecognized compensation expense net of forfeitures	$ 3,200,000
Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	7 years
Minimum [Member] \| Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	12 months
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	10 years
Maximum [Member] \| Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	14 months
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in common stock available for grant	2

Benefit Plans - Summary of Company's Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options, Beginning Balance	1,772,062	2,838,553	3,086,019
Number of Options, granted	203,600	192,800	128,500
Number of Options, exercised	(612,682)	(1,237,341)	(327,498)
Number of Options, cancelled/forfeited/expired	(19,220)	(21,950)	(48,468)
Number of Options, Ending Balance	1,343,760	1,772,062	2,838,553
Weighted-Average Price, Beginning Balance	$ 24.68	$ 24.37	$ 23.52
Number of Options, Exercisable at December 31, 2014	883,605
Weighted-Average Price, Options granted	$ 32.79	29.14	29.63
Number of Options, Expected to Vest after December 31, 2014	414,140
Weighted-Average Price, Options exercised	$ 21.55	24.71	17.95
Weighted-Average Price, Options cancelled/forfeited/expired	30.35	25.20	27.63
Weighted-Average Price, Ending Balance	27.25	$ 24.68	$ 24.37
Weighted-Average Price, Exercisable at December 31, 2014	25.37
Weighted-Average Price, Expected to Vest after December 31, 2014	$ 30.68
Weighted-Average Remaining Contractual Term, Balance At December 31, 2014	2 years 11 months 19 days
Weighted-Average Remaining Contractual Term, Exercisable at December 31, 2014	1 year 9 months 18 days
Weighted-Average Remaining Contractual Term, Expected to Vest after December 31, 2014	5 years 2 months 19 days
Aggregate Intrinsic Value, Balance At December 31, 2014	$ 11.6
Aggregate Intrinsic Value, Exercisable at December 31, 2014	9.3
Aggregate Intrinsic Value, Expected to Vest after December 31, 2014	$ 2.1

Benefit Plans - Options Outstanding and Options Exercisable by Exercise Price with Weighted-Average Remaining Contractual Life for Options Outstanding and Weighted-Average Exercise Price (Detail)	12 Months Ended
	Dec. 31, 2014 $ / shares shares
Exercise Price 15-20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	$ 15
Exercise Price Upper Range Limit	$ 20
Options Outstanding, Number \| shares	149,700
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	1 year 2 months 1 day
Options Outstanding, Weighted-Average Grant Date Value	$ 15.62
Options Exercisable, Number \| shares	149,700
Options Exercisable, Weighted-Average Grant Date Value	$ 15.62
Exercise Price 20-25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	20
Exercise Price Upper Range Limit	$ 25
Options Outstanding, Number \| shares	229,225
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	1 year 9 months 14 days
Options Outstanding, Weighted-Average Grant Date Value	$ 23.19
Options Exercisable, Number \| shares	212,040
Options Exercisable, Weighted-Average Grant Date Value	$ 23.18
Exercise Price 25-30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	25
Exercise Price Upper Range Limit	$ 30
Options Outstanding, Number \| shares	653,435
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	2 years 6 months 21 days
Options Outstanding, Weighted-Average Grant Date Value	$ 29.12
Options Exercisable, Number \| shares	510,465
Options Exercisable, Weighted-Average Grant Date Value	$ 29.24
Exercise Price 30-35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	30
Exercise Price Upper Range Limit	$ 35
Options Outstanding, Number \| shares	302,000
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	5 years 6 months 21 days
Options Outstanding, Weighted-Average Grant Date Value	$ 32.35
Options Exercisable, Number \| shares	10,400
Options Exercisable, Weighted-Average Grant Date Value	$ 32.40
Exercise Price 35-40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	35
Exercise Price Upper Range Limit	$ 40
Options Outstanding, Number \| shares	9,400
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	5 years 11 months 15 days
Options Outstanding, Weighted-Average Grant Date Value	$ 37.83
Options Exercisable, Number \| shares	1,000
Options Exercisable, Weighted-Average Grant Date Value	$ 38.89
Exercise Price 15-40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	15
Exercise Price Upper Range Limit	$ 40
Options Outstanding, Number \| shares	1,343,760
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	2 years 11 months 19 days
Options Outstanding, Weighted-Average Grant Date Value	$ 27.25
Options Exercisable, Number \| shares	883,605
Options Exercisable, Weighted-Average Grant Date Value	$ 25.37

Benefit Plans - Schedule of Weighted-Average Assumptions Used to Determine Fair Value of Option Granted (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2003
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected term (in years)	5 years	5 years	5 years
Expected volatility	40.50%	52.10%	50.30%
Expected dividend yields	3.00%	3.20%	3.30%
Risk-free interest rates	1.50%	0.80%	0.80%

Benefit Plans - Summary of Company's Restricted Stock Units Activity (Detail) - Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning Balance	320,980	262,820	187,810
Number of Shares, granted	118,864	150,300	109,200
Number of Shares, vested	(120,721)	(87,840)	(34,190)
Number of Shares, cancelled/forfeited/expired	(7,540)	(4,300)
Number of Shares, Ending Balance	311,583	320,980	262,820
Weighted-Average Grant Date Fair Value, Beginning Balance	$ 28.47	$ 28.22	$ 26.33
Weighted-Average Grant Date Fair Value, granted	30.85	26.89	31.37
Weighted-Average Grant Date Fair Value, vested	27.30	24.98	27.85
Weighted-Average Grant Date Fair Value, cancelled/forfeited/expired	30.34	29.24
Weighted-Average Grant Date Fair Value, Ending Balance	$ 29.78	$ 28.47	$ 28.22
Aggregate Intrinsic Value	$ 11.2

Shareholders' Equity - Additional Information (Detail) - shares	Dec. 31, 2014	Dec. 31, 2013	May 14, 2008
Stockholders' Equity Note [Abstract]
Repurchases of common stock authorized	0	0	2,000,000
Common stock remaining authorized for repurchase	2,000,000

Commitments and Contingencies - Minimum Payments under Leases, Exclusive of Property Taxes and Insurance (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$ 1,311
2016	910
2017	686
2018	627
Thereafter	0
Total minimum future lease payments	$ 3,534

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 3.4	$ 3.1	$ 3.1

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Trade name	$ 5,700	$ 5,700
Customer relationships	9,611	9,100
Intangible Assets, gross	15,311	14,800
Less accumulated amortization	(4,975)	(4,138)
Intangible Assets, net	$ 10,336	$ 10,662
Estimated useful life (In years), Trade name	Indefinite
Estimated useful life (In years), Customer relationships	11 years

Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Subsequent impairment of the underlying assets	$ 0
Amortization expense	800,000	$ 800,000	$ 800,000
Expected annual amortization expense for 2015	800,000
Expected annual amortization expense for 2016	800,000
Expected annual amortization expense for 2017	800,000
Expected annual amortization expense for 2018	800,000
Expected annual amortization expense for 2019	$ 800,000

Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Related Party Transactions [Abstract]
Acquisition of liquid and solid containment tanks	$ 13,600,000	$ 38,300,000
Amounts due to Sabre Manufacturing, LLC	$ 0
Amount due from (to) related party			$ 0

Segment Reporting - Additional Information (Detail) - Segment	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	4
Customer Concentration Risk [Member] \| Sales [Member]
Segment Reporting Information [Line Items]
Revenues from customers	10.00%	10.00%	10.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Foreign Country Customers [Member]
Segment Reporting Information [Line Items]
Revenues from customers	5.00%	7.00%	9.00%

Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Rental revenues	$ 71,694	$ 69,642	$ 65,809	$ 62,430	$ 66,181	$ 65,941	$ 63,043	$ 60,601	$ 269,575	$ 255,766	$ 248,444
Rental related services revenues									64,132	53,148	46,920
Sales and other revenues									74,415	70,595	68,675
Total revenues	111,792	113,025	95,745	87,560	94,772	108,839	87,156	88,742	408,122	379,509	364,039
Depreciation of rental equipment									72,678	68,208	63,819
Gross profit	52,204	49,298	42,079	38,638	44,630	45,189	40,169	39,027	182,219	169,015	168,259
Interest expense (income) allocation									9,280	8,687	9,149
Income (loss) before provision for income taxes	24,222	22,609	16,794	12,936	19,341	20,679	16,197	15,157	76,561	71,374	72,867
Rental equipment acquisitions									148,602	136,601	128,754
Accounts receivable, net (period end)	101,294				87,650				101,294	87,650	92,256
Rental equipment, at cost (period end)	1,229,638				1,144,168				1,229,638	1,144,168	1,072,845
Rental equipment, net book value (period end)	825,750	$ 817,898	$ 795,532	$ 775,875	767,010	$ 753,810	$ 737,636	$ 726,100	825,750	767,010	718,853
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Rental revenues									96,457	82,503	79,518
Rental related services revenues									35,263	28,891	25,775
Sales and other revenues									29,855	21,267	14,474
Total revenues									161,575	132,661	119,767
Depreciation of rental equipment									16,536	14,459	13,942
Gross profit									63,455	50,423	52,022
Interest expense (income) allocation									4,768	4,318	4,547
Income (loss) before provision for income taxes									16,959	9,617	13,443
Rental equipment acquisitions									82,792	52,953	21,042
Accounts receivable, net (period end)	46,797				37,163				46,797	37,163	39,066
Rental equipment, at cost (period end)	664,340				592,391				664,340	592,391	551,101
Rental equipment, net book value (period end)	473,960				415,366				$ 473,960	$ 415,366	$ 384,813
Utilization (period end)									75.00%	70.70%	66.70%
Average utilization									72.30%	68.30%	66.40%
TRS-RenTelco [Member]
Segment Reporting Information [Line Items]
Rental revenues									$ 99,020	$ 102,101	$ 101,645
Rental related services revenues									3,331	3,095	3,673
Sales and other revenues									25,951	29,857	27,820
Total revenues									128,302	135,053	133,138
Depreciation of rental equipment									40,935	39,953	38,174
Gross profit									60,249	63,520	62,048
Interest expense (income) allocation									2,075	2,156	2,384
Income (loss) before provision for income taxes									34,383	36,633	33,631
Rental equipment acquisitions									45,158	52,625	51,793
Accounts receivable, net (period end)	28,849				27,328				28,849	27,328	24,654
Rental equipment, at cost (period end)	261,995				267,772				261,995	267,772	266,934
Rental equipment, net book value (period end)	105,729				109,988				$ 105,729	$ 109,988	$ 107,999
Utilization (period end)									59.80%	58.20%	64.10%
Average utilization									60.40%	62.70%	65.80%
Adler Tanks [Member]
Segment Reporting Information [Line Items]
Rental revenues									$ 74,098	$ 71,162	$ 67,281
Rental related services revenues									25,538	21,162	17,472
Sales and other revenues									1,152	1,616	2,558
Total revenues									100,788	93,940	87,311
Depreciation of rental equipment									15,207	13,796	11,703
Gross profit									53,452	51,076	51,157
Interest expense (income) allocation									2,618	2,419	2,350
Income (loss) before provision for income taxes									23,605	24,013	26,706
Rental equipment acquisitions									20,652	31,023	55,919
Accounts receivable, net (period end)	21,031				21,915				21,031	21,915	24,323
Rental equipment, at cost (period end)	303,303				284,005				303,303	284,005	254,810
Rental equipment, net book value (period end)	246,061				241,656				$ 246,061	$ 241,656	$ 226,041
Utilization (period end)									63.90%	57.70%	67.50%
Average utilization									62.90%	64.20%	71.50%
Enviroplex [Member]
Segment Reporting Information [Line Items]
Sales and other revenues									$ 17,457	$ 17,855	$ 23,823
Total revenues									17,457	17,855	23,823
Gross profit									5,063	3,996	3,032
Interest expense (income) allocation									(181)	(206)	(132)
Income (loss) before provision for income taxes									1,614	1,111	(913)
Accounts receivable, net (period end)	$ 4,617				$ 1,244				$ 4,617	$ 1,244	$ 4,213

Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 111,792	$ 113,025	$ 95,745	$ 87,560	$ 94,772	$ 108,839	$ 87,156	$ 88,742	$ 408,122	$ 379,509	$ 364,039
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues									161,575	132,661	119,767
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues									17,457	17,855	23,823
Operating Segments [Member] \| Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues									19,017	17,859	24,240
Inter-segment Eliminations [Member] \| Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues									$ 1,560	$ 4	$ 417

Quarterly Financial Information - Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operations Data
Rental revenues	$ 71,694	$ 69,642	$ 65,809	$ 62,430	$ 66,181	$ 65,941	$ 63,043	$ 60,601	$ 269,575	$ 255,766	$ 248,444
Total revenues	111,792	113,025	95,745	87,560	94,772	108,839	87,156	88,742	408,122	379,509	364,039
Gross profit	52,204	49,298	42,079	38,638	44,630	45,189	40,169	39,027	182,219	169,015	168,259
Income from operations	26,796	25,098	18,239	15,227	21,678	22,806	18,377	17,389	85,360	80,250	81,981
Income before provision for income taxes	24,222	22,609	16,794	12,936	19,341	20,679	16,197	15,157	76,561	71,374	72,867
Net income	$ 13,887	$ 13,746	$ 10,205	$ 7,871	$ 11,761	$ 12,573	$ 9,848	$ 9,215	$ 45,709	$ 43,397	$ 44,777
Earnings per share:
Basic	$ 0.54	$ 0.53	$ 0.39	$ 0.31	$ 0.46	$ 0.49	$ 0.39	$ 0.37	$ 1.77	$ 1.71	$ 1.80
Diluted	0.53	0.53	0.39	0.30	0.45	0.48	0.38	0.36	1.75	1.67	1.78
Dividends declared per share	$ 0.245	$ 0.245	$ 0.245	$ 0.245	$ 0.24	$ 0.24	$ 0.24	$ 0.24	$ 0.98	$ 0.96	$ 0.94
Shares used in per share calculations:
Basic	25,999	25,953	25,912	25,789	25,717	25,649	25,354	25,003	25,914	25,433	24,759
Diluted	26,206	26,152	26,220	26,230	26,211	26,095	25,818	25,435	26,175	25,926	25,156
Balance Sheet Data
Rental equipment, net	$ 825,750	$ 817,898	$ 795,532	$ 775,875	$ 767,010	$ 753,810	$ 737,636	$ 726,100	$ 825,750	$ 767,010	$ 718,853
Total assets	1,116,407	1,089,130	1,051,764	1,021,613	1,027,611	1,009,435	985,262	967,131	1,116,407	1,027,611
Notes payable	322,478	322,280	307,000	288,081	290,003	280,902	278,875	281,251	322,478	290,003
Shareholders' equity	$ 424,531	$ 414,519	$ 406,439	$ 401,563	$ 401,030	$ 395,694	$ 387,779	$ 372,864	$ 424,531	$ 401,030	$ 364,738	$ 333,142