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Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues $ 681,838 $ 734,607 $ 752,673 $ 700,864 $ 697,916 $ 656,954 $ 661,611 $ 587,557 $ 2,869,982 $ 2,604,038 $ 2,020,334
Cost of services 580,084 629,181 644,647 599,767 591,441 555,318 562,306 499,566 2,453,679 2,208,631 1,668,763
General and administrative expense 47,931 46,918 48,858 45,242 47,611 47,121 42,776 42,759 188,949 180,267 172,492
Operating income 53,823 58,508 59,168 55,855 58,864 54,515 56,529 45,232 227,354 215,140 179,079
Interest expense (3,985) (3,857) (3,979) (3,970) (4,002) (3,970) (3,598) (997) (15,791) (12,567) (1,141)
Interest income 102 107 59 64 125 51 57 128 332 361 215
Other income (expense), net (289) (20) 3,820 96 (215) 64 (270) (62) 3,607 (483) 355
INCOME FROM OPERATIONS BEFORE INCOME TAXES 49,651 54,738 59,068 52,045 54,772 50,660 52,718 44,301 215,502 202,451 178,508
Net income $ 30,475 $ 34,486 $ 36,442 $ 31,903 $ 34,012 $ 31,376 $ 32,167 $ 27,541 $ 133,306 $ 125,096 $ 111,764
Common Class A [Member]
                      
Basic net income per share $ 0.83 $ 0.94 $ 0.99 $ 0.87 $ 0.94 $ 0.86 $ 0.89 $ 0.76 $ 3.64 $ 3.45 $ 3.13
Basic weighted average common shares 23,578 23,513 23,357 23,206 23,082 23,010 22,872 22,415 23,415 22,847 21,980
Diluted net income per share $ 0.83 $ 0.94 $ 0.99 $ 0.87 $ 0.93 $ 0.86 $ 0.88 $ 0.76 $ 3.63 $ 3.43 $ 3.11
Weighted average common shares outstanding 23,643 23,607 23,510 23,357 23,251 23,171 23,126 22,727 23,530 23,054 22,278
Common Class B [Member]
                      
Basic net income per share $ 0.83 $ 0.94 $ 0.99 $ 0.87 $ 0.94 $ 0.86 $ 0.89 $ 0.76 $ 3.64 $ 3.45 $ 3.13
Basic weighted average common shares 13,193 13,193 13,271 13,275 13,275 13,276 13,317 13,605 13,233 13,367 13,707
Diluted net income per share $ 0.83 $ 0.94 $ 0.99 $ 0.87 $ 0.93 $ 0.86 $ 0.88 $ 0.76 $ 3.63 $ 3.43 $ 3.11
Weighted average common shares outstanding 13,193 13,193 13,271 13,275 13,275 13,276 13,317 13,605 13,233 13,367 13,707