Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010
Operating activities
Net income	$ 64,022		$ 57,129	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	24,046		24,317	[1]
Amortization of other intangible assets	16,795		18,229	[1]
Provision for doubtful accounts	9,483		7,179	[1]
Non-cash share-based compensation	29,043		25,205	[1]
Excess tax benefits from share-based compensation	(198)		(761)	[1]
Non-cash interest expense	6,322		10,132	[1]
Other	(559)		454	[1]
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(130,132)		(34,845)	[1]
Notes receivable	(4,914)		(20,091)	[1]
Prepaid expenses and other assets	(3,670)		1,994	[1]
Accounts payable, accrued expenses and other	14,489		9,120	[1]
Income taxes	1,061		6,164	[1]
Accrued compensation	21,098		(4,188)	[1]
Billings in excess of services provided	(38)		(4,172)	[1]
Net cash provided by operating activities	46,848		95,866	[1]
Investing activities
Payments for acquisition of businesses, including contingent payments, net of cash received	(62,346)		(60,273)	[1]
Purchases of property and equipment	(24,595)		(14,833)	[1]
Proceeds from sale or maturity of short-term investment			15,000	[1]
Other	(127)		(467)	[1]
Net cash used in investing activities	(87,068)		(60,573)	[1]
Financing activities
Borrowings under revolving line of credit	25,000		20,000	[1]
Payments of revolving line of credit	(25,000)		(20,000)	[1]
Payments of long-term debt and capital lease obligations	(6,967)		(190,452)	[1]
Issuance of debt securities, net			391,647	[1]
Payments of debt financing fees			(2,843)	[1]
Purchase and retirement of common stock	(209,400)		(26,138)	[1]
Net issuance of common stock under equity compensation plans	797		4,604	[1]
Excess tax benefits from share-based compensation	198		761	[1]
Other	(1)		442	[1]
Net cash (used in) provided by financing activities	(215,373)		178,021	[1]
Effect of exchange rate changes on cash and cash equivalents	(747)		(1,004)	[1]
Net (decrease) increase in cash and cash equivalents	(256,340)		212,310	[1]
Cash and cash equivalents, beginning of period	384,570	[1]	118,872	[1]
Cash and cash equivalents, end of period	128,230		331,182	[1]
Supplemental cash flow disclosures
Cash paid for interest	31,725		34,504	[1]
Cash paid for income taxes, net of refunds	33,443		28,124	[1]
Non-cash investing and financing activities:
Issuance of notes payable to acquire businesses			39,772	[1]
Issuance of stock units under incentive compensation plans	$ 4,241

[1] As Revised (Note 2)