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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities    
Net income $ 48,891 $ 64,022
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 26,475 21,508
Amortization of other intangible assets 16,948 16,795
Acquisition-related contingent consideration (2,581) 2,538
Provision for doubtful accounts 9,387 9,483
Non-cash share-based compensation 24,465 29,043
Excess tax benefits from share-based compensation (98) (198)
Non-cash interest expense 4,505 6,322
Other 108 (559)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable, billed and unbilled (62,466) (130,132)
Notes receivable (20,732) (4,914)
Prepaid expenses and other assets (3,701) (3,670)
Accounts payable, accrued expenses and other 5,608 14,489
Income taxes (5,595) 1,061
Accrued compensation (33,734) 21,098
Billings in excess of services provided 6,144 (38)
Net cash provided by operating activities 13,624 46,848
Investing activities    
Payments for acquisition of businesses, net of cash received (26,453) (62,346)
Purchases of property and equipment (20,534) (24,595)
Other (1,105) (127)
Net cash used in investing activities (48,092) (87,068)
Financing activities    
Borrowings under revolving line of credit 75,000 25,000
Payments of revolving line of credit   (25,000)
Payments of long-term debt and capital lease obligations (156,487) (6,967)
Purchase and retirement of common stock (20,013) (209,400)
Net issuance of common stock under equity compensation plans 523 797
Excess tax benefits from share-based compensation 98 198
Other (2,080) (1)
Net cash used in financing activities (102,959) (215,373)
Effect of exchange rate changes on cash and cash equivalents (68) (747)
Net decrease in cash and cash equivalents (137,495) (256,340)
Cash and cash equivalents, beginning of period 264,423 384,570
Cash and cash equivalents, end of period 126,928 128,230
Supplemental cash flow disclosures    
Cash paid for interest 31,343 31,725
Cash paid for income taxes, net of refunds 31,968 33,443
Non-cash investing and financing activities:    
Issuance of stock units under incentive compensation plans $ 3,079 $ 4,241