Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 114,483	$ 84,829
Receivables-net	540,468	528,765
Prepaid expenses and other	33,115	16,642
Total Current Assets	688,066	630,236
Property and equipment-net	47,435	27,086
Goodwill	808,455	729,558
Other intangibles-net	177,764	168,487
Employee supplemental savings plan assets	25,026	24,415
Other assets	13,460	10,695
TOTAL ASSETS	1,760,206	1,590,477
CURRENT LIABILITIES:
Accounts payable and accrued expenses	280,277	272,047
Accrued salaries and related expenses	72,467	64,575
Billings in excess of revenue earned	34,956	11,118
Total Current Liabilities	387,700	347,740
Long-term debt	200,000	200,000
Accrued retirement	26,155	25,789
Other long-term liabilities	7,871	7,495
Deferred income taxes-non-current	49,223	43,110
TOTAL LIABILITIES	670,949	624,134
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Additional paid-in capital	406,083	385,407
Treasury stock, 244,113 and 243,040 shares at cost at December 31, 2011 and 2010	(9,158)	(9,114)
Retained earnings	692,272	589,838
Accumulated other comprehensive loss	(311)	(155)
TOTAL STOCKHOLDERS' EQUITY	1,089,257	966,343
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,760,206	1,590,477
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	239	234
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 132	$ 133