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Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Sep. 30, 2011	Nov. 03, 2011
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Entity Registrant Name	MCGRATH RENTCORP
Entity Central Index Key	0000752714
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		24,368,353

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
REVENUES
Rental	$ 60,964	$ 52,674	$ 172,108	$ 145,658
Rental Related Services	10,737	10,401	28,616	25,718
Rental Operations	71,701	63,075	200,724	171,376
Sales	32,783	19,640	55,206	38,535
Other	477	489	1,534	1,546
Total Revenues	104,961	83,204	257,464	211,457
COSTS AND EXPENSES
Depreciation of Rental Equipment	15,357	14,109	44,794	41,665
Rental Related Services	8,321	8,335	22,201	19,721
Other	10,274	12,097	30,479	30,846
Total Direct Costs of Rental Operations	33,952	34,541	97,474	92,232
Costs of Sales	23,622	14,613	37,392	26,865
Total Costs of Revenues	57,574	49,154	134,866	119,097
Gross Profit	47,387	34,050	122,598	92,360
Selling and Administrative Expenses	20,081	16,569	57,284	48,929
Income from Operations	27,306	17,481	65,314	43,431
Interest Expense	2,051	1,632	5,487	4,647
Income Before Provision for Income Taxes	25,255	15,849	59,827	38,784
Provision for Income Taxes	9,900	6,149	23,452	15,048
Net Income	$ 15,355	$ 9,700	$ 36,375	$ 23,736
Earnings Per Share:
Basic	$ 0.63	$ 0.41	$ 1.50	$ 0.99
Diluted	$ 0.62	$ 0.40	$ 1.47	$ 0.98
Shares Used in Per Share Calculation:
Basic	24,362	23,936	24,320	23,884
Diluted	24,719	24,173	24,702	24,138
Cash Dividends Declared Per Share	$ 0.230	$ 0.225	$ 0.690	$ 0.675

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2011	Dec. 31, 2010
ASSETS
Cash	$ 652	$ 990
Accounts Receivable, net of allowance for doubtful accounts of $1,500 in 2011 and $1,700 in 2010	89,641	76,488
Income Taxes Receivable		6,131
Rental Equipment, at cost:
Relocatable Modular Buildings	534,109	514,548
Electronic Test Equipment	266,354	250,125
Liquid and Solid Containment Tanks and Boxes	178,805	133,095
Rental Equipment, gross	979,268	897,768
Less Accumulated Depreciation	(323,414)	(306,188)
Rental Equipment, net	655,854	591,580
Property, Plant and Equipment, net	94,717	83,861
Prepaid Expenses and Other Assets	14,053	13,944
Intangible Assets, net	12,527	12,868
Goodwill	27,700	27,700
Total Assets	895,144	813,562
LIABILITIES AND SHAREHOLDERS' EQUITY
Notes Payable	289,573	265,640
Accounts Payable and Accrued Liabilities	60,786	49,612
Deferred Income	25,431	23,790
Deferred Income Taxes, net	198,944	179,543
Total Liabilities	574,734	518,585
Shareholders' Equity:
Common Stock, no par value - Authorized - 40,000 shares Issued and Outstanding - 24,366 shares in 2011 and 24,235 shares in 2010	69,589	63,623
Retained Earnings	250,821	231,354
Total Shareholders' Equity	320,410	294,977
Total Liabilities and Shareholders' Equity	$ 895,144	$ 813,562

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 1,500	$ 1,700
Common Stock, no par value
Common Stock, shares authorized	40,000,000	40,000,000
Common Stock, shares issued	24,366,000	24,235,000
Common Stock, shares outstanding	24,366,000	24,235,000

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 36,375	$ 23,736
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	49,746	46,269
Provision for Doubtful Accounts	1,373	1,225
Non-Cash Stock-Based Compensation	3,709	3,155
Gain on Sale of Rental Equipment	(9,713)	(8,144)
Change In:
Accounts Receivable	(14,526)	(19,540)
Income Taxes Receivable	6,131	5,147
Prepaid Expenses and Other Assets	(109)	(1,346)
Accounts Payable and Accrued Liabilities	10,467	6,750
Deferred Income	1,641	7,396
Deferred Income Taxes	19,401	1,461
Net Cash Provided by Operating Activities	104,495	66,109
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of Rental Equipment	(120,699)	(93,408)
Purchase of Property, Plant and Equipment	(15,181)	(5,197)
Proceeds from Sale of Used Rental Equipment	21,502	19,791
Net Cash Used in Investing Activities	(114,378)	(78,814)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net Borrowings (Payments) Under Bank Lines of Credit	(64,067)	37,166
Borrowings Under Private Placement	100,000
Principal Payments on Senior Notes	(12,000)	(12,000)
Proceeds from the Exercise of Stock Options	1,848	2,454
Excess Tax Benefit from Exercise and Disqualifying Disposition of Stock Options	408	395
Payment of Dividends	(16,644)	(16,001)
Net Cash Provided by Financing Activities	9,545	12,014
Net Decrease in Cash	(338)	(691)
Cash Balance, beginning of period	990	1,187
Cash Balance, end of period	652	496
Interest Paid, during the period	3,705	4,530
Income Taxes Paid (Refunds Received), during the period	(2,696)	8,030
Dividends Accrued	5,772	5,435
Rental Equipment Acquisitions, not yet paid	$ 5,545	$ 10,592

Condensed Consolidated Financial Information	9 Months Ended
Condensed Consolidated Financial Information	Sep. 30, 2011
Condensed Consolidated Financial Information [Abstract]
Condensed Consolidated Financial Information	NOTE 1. CONDENSED CONSOLIDATED FINANCIAL INFORMATION The condensed consolidated financial statements for the three and nine months ended September 30, 2011 and 2010 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 nine months ended September 30, 2011 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 25, 2011.

- Definition

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

+ References

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+ Details

New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	Sep. 30, 2011
New Accounting Pronouncements [Abstract]
New Accounting Pronouncements	NOTE 2. NEW ACCOUNTING PRONOUNCEMENTS In September 2011, the Financial Accounting Standards Board ("FASB") issued an accounting standards update to permit an entity to first assess 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. This update is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, with early adoption permitted. The Company does not expect the adoption of this update to have a significant impact on its condensed consolidated financial statements. In April 2010, the FASB issued an accounting standards update to clarify that an employee share-based payment award with an exercise price denominated in the currency of a market in which a substantial portion of the entity's equity securities trades, should not be considered to contain a condition that is not a market, performance or service condition. Therefore, an entity would not classify such an award as a liability if it otherwise qualifies as equity. This update is effective for fiscal years, and interim periods within those fiscal years, beginning on or after December 15, 2010. The Company implemented these new requirements in its first quarter of fiscal 2011. The adoption of this accounting guidance did not have a significant impact on the Company's condensed consolidated financial statements.

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

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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.

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+ Details

Earnings Per Share

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 3. 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 September 30,				Nine Months Ended September 30,
(in thousands)	2011		2010		2011		2010
Weighted-average number of shares of common stock for calculating basic earnings per share		24,362		23,936		24,320		23,884
Effect of potentially dilutive securities from equity-based compensation		357		237		382		254

Weighted-average number of shares of common stock for calculating diluted earnings per share		24,719		24,173		24,702		24,138

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
September 30,

Nine Months Ended
September 30,

(in thousands)

2011

2010

2011

2010

Options to purchase shares of common stock

1,175

1,359

1,168

1,349

Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2011
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 4. RELATED PARTY TRANSACTIONS The Company acquired liquid and solid containment tanks totaling $9.2 million and $18.3 million, during the three and nine months ended September 30, 2011, 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 leased one operating facility and receives certain support services from companies controlled by the President of Adler Tank Rentals, LLC, which totaled $0.1 million and $0.2 million in the three and nine months ended September 30, 2011, respectively. Amounts due to the aforementioned related parties at September 30, 2011 totaled $0.4 million.

- Definition

The entire disclosure for related party transactions, including the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. 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

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-Publisher SEC
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-Article 4
-Section 08
-Paragraph k

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+ Details

Notes Payable	9 Months Ended
Notes Payable	Sep. 30, 2011
Notes Payable [Abstract]
Notes Payable	NOTE 5. NOTES PAYABLE On April 21, 2011, the Company entered into a Note Purchase and Private Shelf Agreement (the "Note Purchase Agreement") with Prudential Investment Management, Inc., 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 million of its 4.03% Series A Senior Notes (the "Notes") to the Purchaser. The 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. Proceeds from the offering were used to repay outstanding borrowings under the Company's revolving credit facilities. 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 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.

- 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 Events	9 Months Ended
Subsequent Events	Sep. 30, 2011
Subsequent Events [Abstract]
Subsequent Events	NOTE 6. SUBSEQUENT EVENTS The Company evaluated all events or transactions that occurred after September 30, 2011. During this period, the Company did not have any material subsequent events that require disclosure in these condensed consolidated financial statements.

Segment Reporting

9 Months Ended

Sep. 30, 2011

Segment Reporting [Abstract]

Segment Reporting

NOTE 7. 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 business 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, 2010. 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 nine months ended September 30, 2011 and 2010 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
Nine Months Ended September 30,

2011
Rental Revenues	$	59,689		$	70,370		$	42,049		$	—		$	172,108
Rental Related Services Revenues		17,886			2,273			8,457			—			28,616
Sales and Other Revenues		16,835			19,149			341			20,415			56,740
Total Revenues		94,410			91,792			50,847			20,415			257,464
Depreciation of Rental Equipment		10,306			28,561			5,927			—			44,794
Gross Profit		40,970			41,561			35,053			5,014			122,598
Selling and Administrative Expenses		24,027			18,966			11,704			2,587			57,284
Income from Operations		16,943			22,595			23,349			2,427			65,314
Interest Expense (Income) Allocation		2,935			1,544			1,174			(166	)		5,487
Income before Provision for Income Taxes		14,008			21,051			22,175			2,593			59,827
Rental Equipment Acquisitions		27,556			47,454			45,846			—			120,856
Accounts Receivable, net (period end)		45,199			22,409			18,839			3,194			89,641
Rental Equipment, at cost (period end)		534,109			266,354			178,805			—			979,268
Rental Equipment, net book value (period end)		381,669			110,444			163,741			—			655,854
Utilization (period end) ²		67.0	%		66.3	%		90.5	%
Average Utilization ²		67.1	%		65.4	%		86.4	%

2010
Rental Revenues	$	61,889		$	60,083		$	23,686		$	—		$	145,658
Rental Related Services Revenues		17,206			1,622			6,890			—			25,718
Sales and Other Revenues		15,487			15,607			122			8,865			40,081
Total Revenues		94,582			77,312			30,698			8,865			211,457
Depreciation of Rental Equipment		10,291			27,527			3,847			—			41,665
Gross Profit		41,126			30,631			18,404			2,199			92,360
Selling and Administrative Expenses		21,239			16,798			8,750			2,142			48,929
Income from Operations		19,887			13,833			9,654			57			43,431
Interest Expense (Income) Allocation		2,664			1,349			782			(148	)		4,647
Income before Provision for Income Taxes		17,223			12,484			8,872			205			38,784
Rental Equipment Acquisitions		19,070			32,613			41,539			—			93,222
Accounts Receivable, net (period end)		49,721			19,865			13,267			6,059			88,912
Rental Equipment, at cost (period end)		514,597			250,063			122,382			—			887,042
Rental Equipment, net book value (period end)		370,971			101,157			115,021			—			587,149
Utilization (period end) ²		67.4	%		67.4	%		77.4	%
Average Utilization ²		67.8	%		66.1	%		73.1	%

1	Gross Enviroplex sales revenues were $20,512 and $9,150 for the nine months ended September 30, 2011 and 2010, respectively, which includes inter-segment sales to Mobile Modular of $97 and $285, respectively, 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 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 nine months ended September 30, 2011 and 2010. In addition, total foreign country customers and operations accounted for less than 10% of the Company's revenues and long-lived assets 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

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+ Details