Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 283,680	$ 205,833
Accounts receivable:
Billed receivables	381,464	352,411
Unbilled receivables	248,462	233,307
Allowance for doubtful accounts and unbilled services	(144,825)	(109,273)
Accounts receivable, net	485,101	476,445
Current portion of notes receivable	27,208	33,093
Prepaid expenses and other current assets	60,852	61,800
Current portion of deferred tax assets	27,332	26,690
Total current assets	884,173	803,861
Property and equipment, net of accumulated depreciation	82,163	79,007
Goodwill	1,211,689	1,218,733
Other intangible assets, net of amortization	77,034	97,148
Notes receivable, net of current portion	122,149	108,298
Other assets	53,319	57,900
Total assets	2,430,527	2,364,947
Current liabilities
Accounts payable, accrued expenses and other	99,494	126,886
Accrued compensation	220,959	222,738
Current portion of long-term debt	11,000	6,014
Billings in excess of services provided	35,639	28,692
Total current liabilities	367,092	384,330
Long-term debt, net of current portion	700,000	711,000
Deferred income taxes	161,932	137,697
Other liabilities	98,757	89,661
Total liabilities	1,327,781	1,322,688
Commitments and contingent liabilities (notes 7 and 15)
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 - 41,181 (2014) and 40,526 (2013)	412	405
Additional paid-in capital	393,174	362,322
Retained earnings	789,428	730,621
Accumulated other comprehensive loss	(80,268)	(51,089)
Total stockholders' equity	1,102,746	1,042,259
Total liabilities and stockholders' equity	$ 2,430,527	$ 2,364,947