Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Impact Of Change In Statement Of Cash Flows Presentation To Prior Periods


	Year Ended December 31, 2010								Year Ended December 31, 2009
	As Previously Reported		As Adjusted			Impact			As Previously Reported			As Adjusted			Impact
Unrealized foreign currency losses, net	$	—	$	1,963		$	1,963		$	—		$	2,282		$	2,282
Changes in operating assets and liabilities, net of effects of acquisitions		11,840		12,246			406			19,535			21,639			2,104

Net cash provided by operating activities		185,309		187,678			2,369			153,286			157,672			4,386
Effect of exchange rate changes in cash and cash equivalents		910		(1,459	)		(2,369	)		(2,451	)		(6,837	)		(4,386	)

Net impact to cash and cash equivalents						$	—								$	—

Schedule Of Tax Correction


	Increase (Decrease) to Income Statement Accounts										Increase (Decrease) to Balance Sheet Accounts
	Income Tax Provision				Other Income/ Expense			Net Income			Year ended					Cumulative
Year Ended	R&D Deduction Error		Interest & Penalties		Foreign Currency (Gain)Loss			Total			Income Taxes Payable			Deferred Tax Asset		Income Taxes Payable		Deferred Tax Asset		Retained Earnings
Cumulative 1999 through 2006	$	3,284	$	1,792	$	1,080		$	6,156		$	6,677		$	521	$	6,677	$	521	$	6,156
2007		—		599		752			1,351			1,597			246		8,274		767		7,507
2008		—		538		(1,574	)		(1,036	)		(997	)		39		7,277		806		6,471
2009		—		341		1,842			2,183			2,574			391		9,851		1,197		8,654
2010		989		479		1,377			2,845			3,240			395		13,091		1,592		11,499
2011		220		948		(52	)		1,116			1,391			275		14,482		1,867		12,615

Total	$	4,493	$	4,697	$	3,425		$	12,615		$	14,482		$	1,867

Summary Of Tax Corrections To The Consolidated Financial Statements

Corrected Consolidated Balance Sheets:


	December 31, 2011							December 31, 2010
	As Previously Reported		As Corrected		Increase/ (Decrease)			As Previously Reported		As Corrected		Increase/ (Decrease)
Deferred income taxes, net - current	$	19,780	$	21,647	$	1,867		$	6,677	$	8,269	$	1,592
Total current assets		496,201		498,068		1,867			681,427		683,019		1,592
Total assets		1,697,651		1,699,518		1,867			1,635,584		1,637,176		1,592
Income taxes payable - current		—		14,482		14,482			—		13,091		13,091
Total current liabilities		591,101		605,583		14,482			417,939		431,030		13,091
Total liabilities		795,502		809,984		14,482			603,318		616,409		13,091
Retained earnings		345,672		333,057		(12,615	)		301,697		290,198		(11,499	)
Total Quest Software Inc. stockholders' equity		867,200		854,585		(12,615	)		1,032,266		1,020,767		(11,499	)
Total equity		880,149		867,534		(12,615	)		1,032,266		1,020,767		(11,499	)
Total liabilities and equity		1,697,651		1,699,518		1,867			1,635,584		1,637,176		1,592

Corrected Consolidated Income Statements:


	Year Ended December 31, 2011									Year Ended December 31, 2010									Year Ended December 31, 2009
	As Previously Reported			As Corrected			Increase/ (Decrease)			As Previously Reported			As Corrected			Increase/ (Decrease)			As Previously Reported		As Corrected		Increase/ (Decrease)
Other (expense) income, net	$	(4,802	)	$	(4,750	)	$	(52	)	$	(5,657	)	$	(7,034	)	$	(1,377	)	$	2,549	$	707	$	(1,842	)
Income before income tax provision		85,723			85,775			(52	)		114,919			113,542			(1,377	)		86,037		84,195		(1,842	)
Income tax provision		33,657			34,825			1,168			16,352			17,820			1,468			15,678		16,019		341
Net income		52,066			50,950			(1,116	)		98,567			95,722			(2,845	)		70,359		68,176		(2,183	)
Net income attributable to Quest Software, Inc.		43,975			42,859			(1,116	)		98,567			95,722			(2,845	)		70,359		68,176		(2,183	)
Net income per share:
Basic	$	0.50		$	0.49		$	(0.01	)	$	1.09		$	1.06		$	(0.03	)	$	0.77	$	0.74	$	(0.03	)
Diluted	$	0.49		$	0.48		$	(0.01	)	$	1.06		$	1.03		$	(0.03	)	$	0.75	$	0.72	$	(0.03	)

Corrected Consolidated Statements of Cash Flows:


	Year Ended December 31, 2011							Year Ended December 31, 2010									Year Ended December 31, 2009
	As Previously Reported		As Corrected		Increase/ (Decrease)			As Adjusted ⁽¹⁾			As Corrected			Increase/ (Decrease)			As Adjusted⁽¹⁾			As Corrected			Increase/ (Decrease)
Net income	$	52,066	$	50,950	$	(1,116	)	$	98,567		$	95,722		$	(2,845	)	$	70,359		$	68,176		$	(2,183	)
Unrealized foreign currency losses, net		4,217		4,165		(52	)		1,963			3,340			1,377			2,282			4,124			1,842
Changes in operating assets and liabilities:
Deferred income taxes		4,426		4,145		(281	)		6,286			6,081			(205	)		2,376			2,229			(147	)
Income taxes payable		24,169		25,618		1,449			(23,692	)		(22,019	)		1,673			(3,118	)		(2,630	)		488

Net cash provided by operating activities		195,035		195,035	$	—			187,678			187,678		$	—			157,672			157,672		$	—

(1)	Refer to the above section "Impact of Change in Consolidated Statement of Cash Flows Presentation to Prior Periods".

Summary Of Other Assets


Asset Type	December 31
Asset Type	2011		2010
Cost method investments	$	46,072	$	14,304
Income taxes receivable		828		2,092
Lease security deposits		3,223		2,678
Non-current restricted cash ⁽¹⁾		2,477		1,040
Other		3,027		1,729

Total Other Assets	$	55,627	$	21,843

(1)	As of December 31, 2011, this relates primarily to holdback arrangements designated in relation to certain acquired companies during the year. As of December 31, 2010, this is primarily cash restricted as a condition to certain non-US facility leases.

Property, Plant, And Equipment Estimated Useful Lives


	Years
Building		30
Furniture and fixtures		7
Machinery and equipment		7
Computer equipment		3-5
Computer software		3-7

Reconciliation Of Denominator Of Net Income Per Share


	Year Ended December 31
	2011		2010		2009
Shares used in computing basic net income per share		87,104		90,411		91,926
Dilutive effect of stock options and restricted stock units ⁽¹⁾		1,888		2,871		2,140

Shares used in computing diluted net income per share		88,992		93,282		94,066

(1)	Options to purchase 6,741, 6,524 and 6,314 shares of common stock were outstanding during 2011, 2010 and 2009, respectively, but were not included in the computation of diluted net income per share as inclusion would have been anti-dilutive.

- Definition

Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made.

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