Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 23,680	$ 18,431
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	8,006	7,496
Amortization of other intangible assets	5,564	5,517
Acquisition-related contingent consideration	731	557
Provision for doubtful accounts	4,094	4,569
Non-cash share-based compensation	10,055	10,553
Excess tax benefits from share-based compensation	(124)	(55)
Non-cash interest expense	670	1,933
Other	(11)	73
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(47,711)	(21,996)
Notes receivable	(227)	(14,481)
Prepaid expenses and other assets	531	(7,735)
Accounts payable, accrued expenses and other	16,603	17,694
Income taxes	2,937	(15,627)
Accrued compensation	(28,862)	(67,079)
Billings in excess of services provided	1,760	2,329
Net cash used in operating activities	(2,304)	(57,821)
Investing activities
Payments for acquisition of businesses, net of cash received	(14,676)	(18,595)
Purchases of property and equipment	(7,323)	(4,756)
Other	12	16
Net cash used in investing activities	(21,987)	(23,335)
Financing activities
Payments of long-term debt and capital lease obligations		(156)
Purchase and retirement of common stock	(28,758)
Net issuance of common stock under equity compensation plans	(1,335)	(647)
Excess tax benefits from share-based compensation	124	55
Other	(224)	(370)
Net cash provided by (used in) financing activities	(30,193)	(1,118)
Effect of exchange rate changes on cash and cash equivalents	(1,598)	289
Net decrease in cash and cash equivalents	(56,082)	(81,985)
Cash and cash equivalents, beginning of period	156,785	264,423
Cash and cash equivalents, end of period	100,703	182,438
Supplemental cash flow disclosures
Cash paid for interest	321	2,864
Cash paid for income taxes, net of refunds	6,970	26,222
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	$ 2,825	$ 3,079