Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 92,554	$ 156,785
Restricted cash		1,190
Accounts receivable:
Billed receivables	362,664	314,491
Unbilled receivables	223,875	208,797
Allowance for doubtful accounts and unbilled services	(106,507)	(94,048)
Accounts receivable, net	480,032	429,240
Current portion of notes receivable	34,128	33,194
Prepaid expenses and other current assets	40,298	50,351
Current portion of deferred tax assets	17,765	3,615
Total current assets	664,777	674,375
Property and equipment, net of accumulated depreciation	65,607	68,192
Goodwill	1,263,166	1,260,035
Other intangible assets, net of amortization	101,675	104,181
Notes receivable, net of current portion	110,908	101,623
Other assets	64,748	67,046
Total assets	2,270,881	2,275,452
Current liabilities
Accounts payable, accrued expenses and other	85,974	98,109
Accrued compensation	144,391	168,392
Current portion of long-term debt and capital lease obligations	6,000	6,021
Billings in excess of services provided	25,413	31,675
Total current liabilities	261,778	304,197
Long-term debt and capital lease obligations, net of current portion	717,000	717,024
Deferred income taxes	129,111	105,751
Other liabilities	83,425	80,248
Total liabilities	1,191,314	1,207,220
Commitments and contingent liabilities (notes 8, 10 and 11)
Stockholders' equity
Preferred stock, $0.01 par value; shares authorized-5,000; none outstanding
Common stock, $0.01 par value; shares authorized-75,000; shares issued and outstanding-40,494 (2013) and 40,755 (2012)	405	408
Additional paid-in capital	359,373	367,978
Retained earnings	788,381	741,215
Accumulated other comprehensive loss	(68,592)	(41,369)
Total stockholders' equity	1,079,567	1,068,232
Total liabilities and stockholders' equity	$ 2,270,881	$ 2,275,452