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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2012	Jul. 30, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	MCGRATH RENTCORP
Entity Central Index Key	0000752714
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		24,771,569

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUES
Rental	$ 60,389	$ 57,118	$ 119,909	$ 111,144
Rental Related Services	11,028	9,387	21,693	17,879
Rental Operations	71,417	66,505	141,602	129,023
Sales	11,830	12,489	19,936	22,423
Other	518	515	1,156	1,100
Total Revenues	83,765	79,509	162,694	152,546
Direct Costs of Rental Operations
Depreciation of Rental Equipment	15,672	14,842	31,073	29,437
Rental Related Services	9,011	7,139	17,564	13,880
Other	10,718	10,665	21,158	20,205
Total Direct Costs of Rental Operations	35,401	32,646	69,795	63,522
Costs of Sales	7,584	7,525	12,284	13,770
Total Costs of Revenues	42,985	40,171	82,079	77,292
Gross Profit	40,780	39,338	80,615	75,254
Selling and Administrative Expenses	21,163	18,624	42,524	37,246
Income from Operations	19,617	20,714	38,091	38,008
Interest Expense	2,382	1,954	4,555	3,436
Income Before Provision for Income Taxes	17,235	18,760	33,536	34,572
Provision for Income Taxes	6,756	7,354	13,146	13,552
Net Income	$ 10,479	$ 11,406	$ 20,390	$ 21,020
Earnings Per Share:
Basic	$ 0.42	$ 0.47	$ 0.83	$ 0.87
Diluted	$ 0.42	$ 0.46	$ 0.81	$ 0.85
Shares Used in Per Share Calculation:
Basic	24,765	24,340	24,702	24,299
Diluted	25,149	24,742	25,139	24,700
Cash Dividends Declared Per Share	$ 0.235	$ 0.230	$ 0.470	$ 0.460

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash	$ 340	$ 1,229
Accounts Receivable, net of allowance for doubtful accounts of $2,200 in 2012 and $1,500 in 2011	86,402	92,671
Rental Equipment, at cost:
Relocatable Modular Buildings	547,248	539,147
Electronic Test Equipment	270,747	258,586
Liquid and Solid Containment Tanks and Boxes	235,022	201,456
Rental Equipment, gross	1,053,017	999,189
Less Accumulated Depreciation	(342,099)	(326,043)
Rental Equipment, net	710,918	673,146
Property, Plant and Equipment, net	99,731	94,702
Prepaid Expenses and Other Assets	26,659	17,170
Intangible Assets, net	11,899	12,311
Goodwill	27,700	27,700
Total Assets	963,649	918,929
Liabilities:
Notes Payable	308,000	296,500
Accounts Payable and Accrued Liabilities	64,822	58,854
Deferred Income	28,714	25,067
Deferred Income Taxes, net	214,613	205,366
Total Liabilities	616,149	585,787
Shareholders' Equity:
Common Stock, no par value - Authorized - 40,000 shares Issued and Outstanding - 24,772 shares in 2012 and 24,576 shares in 2011	80,725	74,878
Retained Earnings	266,775	258,264
Total Shareholders' Equity	347,500	333,142
Total Liabilities and Shareholders' Equity	$ 963,649	$ 918,929

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 2,200	$ 1,500
Common stock, no par value
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	24,772	24,576
Common stock, shares outstanding	24,772	24,576

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 20,390	$ 21,020
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	35,339	32,636
Provision for Doubtful Accounts	1,301	825
Non-Cash Stock-Based Compensation	2,077	2,127
Gain on Sale of Used Rental Equipment	(5,968)	(6,496)
Change In:
Accounts Receivable	4,968	(3,167)
Income Taxes Receivable		6,131
Prepaid Expenses and Other Assets	(9,489)	(8,821)
Accounts Payable and Accrued Liabilities	3,761	9,887
Deferred Income	3,647	7,191
Deferred Income Taxes	9,247	10,116
Net Cash Provided by Operating Activities	65,273	71,449
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of Rental Equipment	(73,281)	(71,160)
Purchase of Property, Plant and Equipment	(8,883)	(10,828)
Proceeds from Sale of Used Rental Equipment	12,206	13,703
Net Cash Used in Investing Activities	(69,958)	(68,285)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net Borrowings (Repayments) Under Bank Lines of Credit	11,500	(83,140)
Borrowings Under Private Placement		100,000
Principal Payments on Senior Notes		(12,000)
Proceeds from the Exercise of Stock Options	3,086	1,770
Excess Tax Benefit from Exercise and Disqualifying Disposition of Stock Options	684	696
Payment of Dividends	(11,474)	(11,043)
Net Cash Provided by (Used in) Financing Activities	3,796	(3,717)
Net Decrease in Cash	(889)	(553)
Cash Balance, beginning of period	1,229	990
Cash Balance, end of period	340	437
Interest Paid, during the period	4,616	2,658
Net Income Taxes Paid (Refunds Received), during the period	3,216	(3,598)
Dividends Accrued During the period, not yet paid	6,057	5,376
Rental Equipment Acquisitions, not yet paid	$ 9,989	$ 11,812

Condensed Consolidated Financial Information

6 Months Ended

Jun. 30, 2012

Condensed Consolidated Financial Information [Abstract]

CONDENSED CONSOLIDATED FINANCIAL INFORMATION

NOTE 1. CONDENSED CONSOLIDATED FINANCIAL INFORMATION

The condensed consolidated financial statements for the three and six months ended June 30, 2012 and 2011 have not been audited, but in the opinion of management, all adjustments (consisting of normal recurring accruals, consolidation and eliminating entries) necessary for the fair presentation of the consolidated financial positions, results of operations and cash flows of McGrath RentCorp (the “Company”) have been made. The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to those rules and regulations. The consolidated results for the six months ended June 30, 2012 should not be considered as necessarily indicative of the consolidated results for the entire fiscal year. These condensed consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s latest annual report on Form 10-K filed with the SEC on February 29, 2012.

Comprehensive income is equivalent to net income for all periods presented.

In order to conform to current year presentation, certain amounts in 2011 were reclassified from selling and administrative expenses to other revenues. This reclassification had no impact on net income, earnings per share or operating cash flows.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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-Name Statement of Position (SOP)
-Number 94-6
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-Name Accounting Research Bulletin (ARB)
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+ Details

Earnings Per Share

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

EARNINGS PER SHARE

NOTE 2. 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 as net income divided by the weighted-average number of shares outstanding of common stock and common stock equivalents for the period, including the dilutive effects of stock options and other potentially dilutive securities. Common stock equivalents result from the number of dilutive options and are computed using the treasury stock method and the average share price for the reported period. The table below presents the weighted-average number of shares of common stock used to calculate basic and diluted earnings per share:


	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2012		2011		2012		2011
Weighted-average number of shares of common stock for calculating basic earnings per share		24,765		24,340		24,702		24,299

Effect of potentially dilutive securities from equity-based compensation		384		402		437		401

Weighted-average number of shares of common stock for calculating diluted earnings per share		25,149		24,742		25,139		24,700

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

Three Months Ended
June 30,

Six Months Ended
June 30,

(in thousands)

2012

2011

2012

2011

Options to purchase shares of common stock

1,049

1,280

1,034

1,288

Related Party Transactions

6 Months Ended

Jun. 30, 2012

RELATED PARTY TRANSACTIONS

NOTE 3. RELATED PARTY TRANSACTIONS

The Company acquired liquid and solid containment tanks totaling $8.0 million and $21.8 million during the three and six months ended June 30, 2012, respectively, from Sabre Manufacturing, LLC, which is controlled by the President of Adler Tank Rentals, LLC, a wholly-owned subsidiary of the Company. In addition, the Company receives certain support services from a company controlled by the President of Adler Tank Rentals, LLC, which were insignificant in the three and six months ended June 30, 2012. Amounts due to related parties at June 30, 2012 totaled $2.0 million.

- 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.

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+ Details

Notes Payable

6 Months Ended

Jun. 30, 2012

Notes Payable [Abstract]

NOTES PAYABLE

NOTE 4. NOTES PAYABLE

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 replaces 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. The Amended Credit Facility contains customary covenants limiting the Company’s ability to, among other things, incur liens, make investments, incur indebtedness, merge or consolidate with others or dispose of assets, pay dividends or distributions, redeem or repurchase Company stock, change the nature of its business, and enter into transactions with affiliates. In addition, the Amended Credit Facility contains financial covenants requiring the Company to not: (1) permit the Consolidated Fixed Charge Coverage Ratio (as defined in the Amended Credit Facility) as of the end of any fiscal quarter to be less than 2.50 to 1.00; (2) permit the Consolidated Leverage Ratio (as defined in the Amended Credit Facility) at any time during any period of four consecutive fiscal quarters to be greater than 2.75 to 1.00; and (3) permit Tangible Net Worth (as defined in the Amended Credit Facility) as of the end of any fiscal quarter of the Company to be less than the sum of (i) $246,103,400 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.

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.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Subsequent Event

6 Months Ended

Jun. 30, 2012

Subsequent Event [Abstract]

SUBSEQUENT EVENT

NOTE 5. SUBSEQUENT EVENT

On July 2, 2012 the Company decided to exit the environmental test equipment rental business over the next three to twelve months after concluding it would be unable to become a meaningfully profitable rental business. The plans for exiting the business include exploring a sale of the business in its entirety, or if this approach is unsuccessful, selling off the rental equipment assets over the next six to twelve months while continuing to serve customers’ rental needs. The Company does not believe the exit of this business will have a significant impact on the Company’s condensed consolidated financial statements.

Segment Reporting

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

SEGMENT REPORTING

NOTE 6. SEGMENT REPORTING

The Company’s four reportable segments are (1) its modular building rental division (“Mobile Modular”); (2) its electronic test equipment rental division (“TRS-RenTelco”); (3) its containment solutions for the storage of hazardous and non-hazardous liquids and solids division (“Adler Tanks”); and (4) its classroom manufacturing division selling modular buildings used primarily as classrooms in California (“Enviroplex”). The operations of each of these segments are described in Part I – Item 1, “Business”, and the accounting policies of the segments are described in “Note 2 – Significant Accounting Policies” in the Company’s annual report on Form 10-K for the year ended December 31, 2011. Management focuses on several key measures to evaluate and assess each segment’s performance, including rental revenue growth, gross profit, income from operations and income before provision for income taxes. 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 among Mobile Modular, TRS-RenTelco and Adler Tanks based on their pro-rata share of average rental equipment at cost, 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 six months ended June, 2012 and 2011 for the Company’s reportable segments is shown in the following table:


(dollar amounts in thousands)	Mobile Modular			TRS-RenTelco			Adler Tanks			Enviroplex ¹			Consolidated
Six Months Ended June 30,

2012
Rental Revenues	$	39,413		$	48,267		$	32,229		$	—		$	119,909
Rental Related Services Revenues		12,200			1,684			7,809			—			21,693
Sales and Other Revenues		4,522			11,151			696			4,723			21,092
Total Revenues		56,135			61,102			40,734			4,723			162,694
Depreciation of Rental Equipment		6,959			18,610			5,504			—			31,073
Gross Profit		24,505			28,842			26,004			1,264			80,615
Selling and Administrative Expenses		16,779			13,105			10,409			2,231			42,524
Income (Loss) from Operations		7,726			15,737			15,595			(967	)		38,091
Interest Expense (Income) Allocation		2,294			1,198			1,134			(71	)		4,555
Income (Loss) before Provision for Income Taxes		5,432			14,539			14,461			(896	)		33,536
Rental Equipment Acquisitions		11,702			29,379			34,041			—			75,122
Accounts Receivable, net (period end)		34,762			23,120			20,169			8,351			86,402
Rental Equipment, at cost (period end)		547,248			270,747			235,022			—			1,053,017
Rental Equipment, net book value (period end)		385,901			112,922			212,095			—			710,918
Utilization (period end) ²		65.6	%		65.7	%		67.5	%
Average Utilization ²		66.2	%		65.9	%		73.3	%

2011
Rental Revenues	$	39,566		$	45,611		$	25,967		$	—		$	111,144
Rental Related Services Revenues		11,321			1,402			5,156			—			17,879
Sales and Other Revenues		8,241			13,162			170			1,950			23,523
Total Revenues		59,128			60,175			31,293			1,950			152,546
Depreciation of Rental Equipment		6,849			18,836			3,752			—			29,437
Gross Profit		26,429			27,044			21,177			604			75,254
Selling and Administrative Expenses		15,599			12,649			7,317			1,681			37,246
Income (Loss) from Operations		10,830			14,395			13,860			(1,077	)		38,008
Interest Expense (Income) Allocation		1,854			972			717			(107	)		3,436
Income (Loss) before Provision for Income Taxes		8,976			13,423			13,143			(970	)		34,572
Rental Equipment Acquisitions		18,910			31,927			26,745			—			77,582
Accounts Receivable, net (period end)		36,591			21,711			16,882			3,646			78,830
Rental Equipment, at cost (period end)		529,056			260,563			159,756			—			949,375
Rental Equipment, net book value (period end)		378,689			106,970			146,859			—			632,518
Utilization (period end) ²		67.7	%		65.4	%		86.4	%
Average Utilization ²		67.2	%		65.3	%		85.4	%

1.	Gross Enviroplex sales revenues were $4,723 and $1,952 for the six months ended June 30, 2012 and 2011, respectively. There were no inter-segment sales to Mobile Modular in these periods, which require elimination in consolidation.

Utilization is calculated each month by dividing the cost of rental equipment on rent by the total cost of rental equipment excluding accessory equipment and for Mobile Modular and Adler Tanks excluding new equipment inventory. 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 for the six months ended June 30, 2012 and 2011. Revenues from foreign country customers accounted for 11% of the Company’s total revenues for the same periods.

- 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
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Weighted-average number of shares of common stock used to calculate basic and diluted earnings per share


	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2012		2011		2012		2011
Weighted-average number of shares of common stock for calculating basic earnings per share		24,765		24,340		24,702		24,299

Effect of potentially dilutive securities from equity-based compensation		384		402		437		401

Weighted-average number of shares of common stock for calculating diluted earnings per share		25,149		24,742		25,139		24,700

Securities not included in the computation of diluted earnings per share

Three Months Ended
June 30,

Six Months Ended
June 30,

(in thousands)

2012

2011

2012

2011

Options to purchase shares of common stock

1,049

1,280

1,034

1,288

Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Summarized financial information for the Company's reportable segments


(dollar amounts in thousands)	Mobile Modular			TRS-RenTelco			Adler Tanks			Enviroplex ¹			Consolidated
Six Months Ended June 30,

2012
Rental Revenues	$	39,413		$	48,267		$	32,229		$	—		$	119,909
Rental Related Services Revenues		12,200			1,684			7,809			—			21,693
Sales and Other Revenues		4,522			11,151			696			4,723			21,092
Total Revenues		56,135			61,102			40,734			4,723			162,694
Depreciation of Rental Equipment		6,959			18,610			5,504			—			31,073
Gross Profit		24,505			28,842			26,004			1,264			80,615
Selling and Administrative Expenses		16,779			13,105			10,409			2,231			42,524
Income (Loss) from Operations		7,726			15,737			15,595			(967	)		38,091
Interest Expense (Income) Allocation		2,294			1,198			1,134			(71	)		4,555
Income (Loss) before Provision for Income Taxes		5,432			14,539			14,461			(896	)		33,536
Rental Equipment Acquisitions		11,702			29,379			34,041			—			75,122
Accounts Receivable, net (period end)		34,762			23,120			20,169			8,351			86,402
Rental Equipment, at cost (period end)		547,248			270,747			235,022			—			1,053,017
Rental Equipment, net book value (period end)		385,901			112,922			212,095			—			710,918
Utilization (period end) ²		65.6	%		65.7	%		67.5	%
Average Utilization ²		66.2	%		65.9	%		73.3	%

2011
Rental Revenues	$	39,566		$	45,611		$	25,967		$	—		$	111,144
Rental Related Services Revenues		11,321			1,402			5,156			—			17,879
Sales and Other Revenues		8,241			13,162			170			1,950			23,523
Total Revenues		59,128			60,175			31,293			1,950			152,546
Depreciation of Rental Equipment		6,849			18,836			3,752			—			29,437
Gross Profit		26,429			27,044			21,177			604			75,254
Selling and Administrative Expenses		15,599			12,649			7,317			1,681			37,246
Income (Loss) from Operations		10,830			14,395			13,860			(1,077	)		38,008
Interest Expense (Income) Allocation		1,854			972			717			(107	)		3,436
Income (Loss) before Provision for Income Taxes		8,976			13,423			13,143			(970	)		34,572
Rental Equipment Acquisitions		18,910			31,927			26,745			—			77,582
Accounts Receivable, net (period end)		36,591			21,711			16,882			3,646			78,830
Rental Equipment, at cost (period end)		529,056			260,563			159,756			—			949,375
Rental Equipment, net book value (period end)		378,689			106,970			146,859			—			632,518
Utilization (period end) ²		67.7	%		65.4	%		86.4	%
Average Utilization ²		67.2	%		65.3	%		85.4	%

1.	Gross Enviroplex sales revenues were $4,723 and $1,952 for the six months ended June 30, 2012 and 2011, respectively. There were no inter-segment sales to Mobile Modular in these periods, which require elimination in consolidation.

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
Earnings Per Share (Details) - shares shares in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Weighted-average number of shares of common stock used to calculate basic and diluted earnings per share
Weighted-average number of shares of common stock for calculating basic earnings per share	24,765	24,340	24,702	24,299
Effect of potentially dilutive securities from equity-based compensation	384	402	437	401
Weighted-average number of shares of common stock for calculating diluted earnings per share	25,149	24,742	25,139	24,700

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Topic 260
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share (Details 1) - shares shares in Thousands	3 Months Ended		6 Months Ended
Earnings Per Share (Details 1) - shares shares in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Securities not included in the computation of diluted earnings per share
Options to purchase shares of common stock	1,049	1,280	1,034	1,288

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Related Party Transactions (Details Textual) $ in Millions	3 Months Ended	6 Months Ended
Related Party Transactions (Details Textual) $ in Millions	Jun. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)
Related Party Transactions (Textual) [Abstract]
Acquisition of liquid and solid containment tanks	$ 8.0	$ 21.8
Amounts due to related parties	$ 2.0	$ 2.0

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ References + Details

Notes Payable (Details Textual)	6 Months Ended
Notes Payable (Details Textual)	Jun. 30, 2012 USD ($)
Unsecured Revolving Credit Facility Before Amendment [Member]
Notes Payable (Textual) [Abstract]
Unsecured Revolving credit facility	$ 350,000,000
Unsecured Revolving Credit Facility After Amended [Member]
Notes Payable (Textual) [Abstract]
Revolving credit facility before amended	Jun. 15, 2017
Unsecured Revolving credit facility	$ 420,000,000
Line of Credit Facility Covenants Tangible Net Worth Description	Permit the Tangible Net Worth (as defined in the Amended Credit Facility) as of the end of any fiscal quarter of the Company to be less than the sum of (i) $246,103,400 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
Line of Credit Facility Covenants Aggregate Fixed Charge Coverage Ratio Period	4 years
Tangible net worth Sum	$ 246,103,400
Consolidated Net Income	0.25
Net Cash Proceeds from issuance of Capital Stock	0.90
Revolving credit facility capacity Period after amendment	5 years
Revolving Enhanced Borrowing	$ 450,000,000
Line of Credit Facility Additional Capacity Available	$ 30,000,000
Letter of Credit [Member]
Notes Payable (Textual) [Abstract]
Revolving credit facility before amended	Jun. 15, 2017
Unsecured Revolving credit facility	$ 25,000,000
Credit facility, current	5,000,000
Credit facility, maximum	10,000,000
Swingline Loans [Member]
Notes Payable (Textual) [Abstract]
Unsecured Revolving credit facility	$ 10,000,000
Maximum [Member] \| Unsecured Revolving Credit Facility After Amended [Member]
Notes Payable (Textual) [Abstract]
Line of Credit Facility covenants aggregate Fixed Charge Coverage Ratio	2.5
Consolidated Leverage Ratio	2.75
Minimum [Member] \| Unsecured Revolving Credit Facility After Amended [Member]
Notes Payable (Textual) [Abstract]
Line of Credit Facility covenants aggregate Fixed Charge Coverage Ratio	1.00
Consolidated Leverage Ratio	1.00

Subsequent Event (Details)	Jul. 02, 2012
Minimum [Member]
Subsequent Event (Textual) [Abstract]
Environmental test equipment rental business, winding up period	3 months
Tenure of selling off rental equipment assets	6 months
Maximum [Member]
Subsequent Event (Textual) [Abstract]
Environmental test equipment rental business, winding up period	12 months
Tenure of selling off rental equipment assets	12 months

Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Segment Reporting (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Summarized financial information for the Company's reportable segments
Rental Revenues	$ 60,389	$ 57,118	$ 119,909	$ 111,144
Rental Related Services Revenues	11,028	9,387	21,693	17,879
Sales and Other Revenues	11,830	12,489	19,936	22,423
Total Revenues	83,765	79,509	162,694	152,546
Depreciation of Rental Equipment	15,672	14,842	31,073	29,437
Gross Profit	40,780	39,338	80,615	75,254
Selling and Administrative Expenses	21,163	18,624	42,524	37,246
Income (Loss) from Operations	19,617	20,714	38,091	38,008
Interest Expense (Income) Allocation	2,382	1,954	4,555	3,436
Income (Loss) before Provision for Income Taxes	17,235	18,760	33,536	34,572
Rental Equipment Acquisitions			9,989	11,812
Accounts Receivable, net (period end)	86,402		86,402		$ 92,671
Rental Equipment, at cost (period end)	1,053,017		1,053,017		999,189
Rental Equipment, net book value (period end)	710,918		710,918		$ 673,146
Mobile Modular [Member]
Summarized financial information for the Company's reportable segments
Rental Revenues			39,413	39,566
Rental Related Services Revenues			12,200	11,321
Sales and Other Revenues			4,522	8,241
Total Revenues			56,135	59,128
Depreciation of Rental Equipment			6,959	6,849
Gross Profit			24,505	26,429
Selling and Administrative Expenses			16,779	15,599
Income (Loss) from Operations			7,726	10,830
Interest Expense (Income) Allocation			2,294	1,854
Income (Loss) before Provision for Income Taxes			5,432	8,976
Rental Equipment Acquisitions			11,702	18,910
Accounts Receivable, net (period end)	34,762	36,591	34,762	36,591
Rental Equipment, at cost (period end)	547,248	529,056	547,248	529,056
Rental Equipment, net book value (period end)	385,901	378,689	$ 385,901	$ 378,689
Utilization (period end)			65.60%	67.70%
Average Utilization			66.20%	67.20%
TRS-RenTelco [Member]
Summarized financial information for the Company's reportable segments
Rental Revenues			$ 48,267	$ 45,611
Rental Related Services Revenues			1,684	1,402
Sales and Other Revenues			11,151	13,162
Total Revenues			61,102	60,175
Depreciation of Rental Equipment			18,610	18,836
Gross Profit			28,842	27,044
Selling and Administrative Expenses			13,105	12,649
Income (Loss) from Operations			15,737	14,395
Interest Expense (Income) Allocation			1,198	972
Income (Loss) before Provision for Income Taxes			14,539	13,423
Rental Equipment Acquisitions			29,379	31,927
Accounts Receivable, net (period end)	23,120	21,711	23,120	21,711
Rental Equipment, at cost (period end)	270,747	260,563	270,747	260,563
Rental Equipment, net book value (period end)	112,922	106,970	$ 112,922	$ 106,970
Utilization (period end)			65.70%	65.40%
Average Utilization			65.90%	65.30%
Adler Tanks [Member]
Summarized financial information for the Company's reportable segments
Rental Revenues			$ 32,229	$ 25,967
Rental Related Services Revenues			7,809	5,156
Sales and Other Revenues			696	170
Total Revenues			40,734	31,293
Depreciation of Rental Equipment			5,504	3,752
Gross Profit			26,004	21,177
Selling and Administrative Expenses			10,409	7,317
Income (Loss) from Operations			15,595	13,860
Interest Expense (Income) Allocation			1,134	717
Income (Loss) before Provision for Income Taxes			14,461	13,143
Rental Equipment Acquisitions			34,041	26,745
Accounts Receivable, net (period end)	20,169	16,882	20,169	16,882
Rental Equipment, at cost (period end)	235,022	159,756	235,022	159,756
Rental Equipment, net book value (period end)	212,095	146,859	$ 212,095	$ 146,859
Utilization (period end)			67.50%	86.40%
Average Utilization			73.30%	85.40%
Enviroplex [Member]
Summarized financial information for the Company's reportable segments
Rental Revenues
Rental Related Services Revenues
Sales and Other Revenues			4,723	$ 1,950
Total Revenues			4,723	1,950
Depreciation of Rental Equipment
Gross Profit			1,264	604
Selling and Administrative Expenses			2,231	1,681
Income (Loss) from Operations			(967)	(1,077)
Interest Expense (Income) Allocation			(71)	(107)
Income (Loss) before Provision for Income Taxes			(896)	(970)
Rental Equipment Acquisitions
Accounts Receivable, net (period end)	8,351	3,646	8,351	3,646
Rental Equipment, at cost (period end)
Rental Equipment, net book value (period end)
Consolidated [Member]
Summarized financial information for the Company's reportable segments
Rental Revenues			119,909	111,144
Rental Related Services Revenues			21,693	17,879
Sales and Other Revenues			21,092	23,523
Total Revenues			162,694	152,546
Depreciation of Rental Equipment			31,073	29,437
Gross Profit			80,615	75,254
Selling and Administrative Expenses			42,524	37,246
Income (Loss) from Operations			38,091	38,008
Interest Expense (Income) Allocation			4,555	3,436
Income (Loss) before Provision for Income Taxes			33,536	34,572
Rental Equipment Acquisitions			75,122	77,582
Accounts Receivable, net (period end)	86,402	78,830	86,402	78,830
Rental Equipment, at cost (period end)	1,053,017	949,375	1,053,017	949,375
Rental Equipment, net book value (period end)	$ 710,918	$ 632,518	$ 710,918	$ 632,518

Segment Reporting (Details Textual) $ in Thousands	6 Months Ended
Segment Reporting (Details Textual) $ in Thousands	Jun. 30, 2012 USD ($) Segment	Jun. 30, 2011 USD ($)
Segment Reporting (Textual) [Abstract]
Foreign country customers revenue	10.00%	10.00%
Segment Reporting (Additional Textual) [Abstract]
Number of reportable segments \| Segment	4
Enviroplex [Member]
Segment Reporting (Textual) [Abstract]
Sales revenues	$ 4,723	$ 1,952
Mobile Modular [Member]
Segment Reporting (Textual) [Abstract]
Sales revenues	$ 0	$ 0
Foreign Country Customers [Member]
Segment Reporting (Textual) [Abstract]
Foreign country customers revenue	11.00%	11.00%