Restatement of Previously Issued Financial Statements (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Net income	$ 82,688	$ 2,141		$ 27,575
Excess tax benefits from stock-based compensation	1,216
Accounts receivable	(4,000)
Prepaid expenses and other assets	(3,051)
Accounts payable	(14,310)
Accrued expenses and other liabilities	(26,765)
Deferred revenue	(16,111)
Net cash (used in) provided by operating activities	109,831
Purchase of equity interest	0
Net cash provided by (used in) investing activities	6,079
Issuance of common stock — equity plans	7,958
Excess tax benefits for stock-based compensation	(1,216)
Purchase of treasury stock and other, net	(5,745)
Conversion of warrants	671
Net cash (used in) provided by financing activities	(59)
Scenario, Previously Reported [Member]
Net income		17,718		26,339
Excess tax benefits from stock-based compensation		0		0
Deferred income taxes		(1,949)		4,242
Accounts receivable		(2,613)		9,894
Prepaid expenses and other assets		(5,138)		(1,403)
Accounts payable		11,397		4,525
Accrued expenses and other liabilities		(4,622)		1,356
Deferred revenue		(22,322)		4,226
Net cash (used in) provided by operating activities		65,172		96,481
Payment of direct costs related to acquisitions		(3,625)		(5,110)
Purchase of equity interest				0
Net cash provided by (used in) investing activities		19,736		(300,037)
Issuance of common stock — equity plans		15,370
Excess tax benefits for stock-based compensation		0		0
Purchase of treasury stock and other, net		(5,127)
Conversion of warrants		0
Net cash (used in) provided by financing activities		10,243		245,968
Supplemental Disclosures of Cash Flow Information:
Increase of goodwill recorded in acquisitions		91,588
Restatement Adjustment [Member]
Net income		(15,577)		1,236
Excess tax benefits from stock-based compensation		(278)		(720)
Deferred income taxes		(8,655)		1,711
Accounts receivable		(3,321)		(4,606)
Prepaid expenses and other assets		2,934		102
Accounts payable		542		70
Accrued expenses and other liabilities		(1,916)		231
Deferred revenue		22,845		(1,774)
Net cash (used in) provided by operating activities		(3,426)		(3,750)
Payment of direct costs related to acquisitions				5,110
Purchase of equity interest				(2,079)
Net cash provided by (used in) investing activities		3,625		3,031
Issuance of common stock — equity plans		(477)
Excess tax benefits for stock-based compensation		278		720
Purchase of treasury stock and other, net		(179)
Conversion of warrants		179
Net cash (used in) provided by financing activities		(199)		720
Supplemental Disclosures of Cash Flow Information:
Increase of goodwill recorded in acquisitions		5,741
As Restated [Member]
Net income		2,141	[1]	27,575	[1]
Excess tax benefits from stock-based compensation		(278)	[1]	(720)	[1]
Deferred income taxes		(10,604)		5,953
Accounts receivable		(5,934)	[1]	5,288	[1]
Prepaid expenses and other assets		(2,204)	[1]	(1,301)	[1]
Accounts payable		11,939	[1]	4,595	[1]
Accrued expenses and other liabilities		(6,538)	[1]	1,587	[1]
Deferred revenue		523	[1]	2,452	[1]
Net cash (used in) provided by operating activities		61,746	[1]	92,731	[1]
Payment of direct costs related to acquisitions		0		0
Purchase of equity interest		0	[1]	(2,079)	[1]
Net cash provided by (used in) investing activities		23,361	[1]	(297,006)	[1]
Issuance of common stock — equity plans		14,893	[1]	14,849	[1]
Excess tax benefits for stock-based compensation		278	[1]	720	[1]
Purchase of treasury stock and other, net		(5,306)	[1]	(6,543)	[1]
Conversion of warrants		179	[1]	0	[1]
Net cash (used in) provided by financing activities		10,044	[1]	246,688	[1]
Supplemental Disclosures of Cash Flow Information:
Increase of goodwill recorded in acquisitions		97,329
Scenario, Other Adjustments [Member] | Restatement Adjustment [Member]
Payment of direct costs related to acquisitions		$ 3,625		$ 3,031

[1] As restated - See Note 23 “Restatement of Previously Issued Financial Statements” of Notes to Consolidated Financial Statements.