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Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,083,864 | $ 1,075,119 | $ 1,063,228 | $ 1,023,684 | $ 1,034,213 | $ 1,033,173 | $ 1,028,383 | $ 1,015,444 | $ 4,245,895 | $ 4,111,213 | $ 3,776,976
Gross margin | 443,216 | 437,478 | 432,108 | 410,290 | 416,425 | 415,249 | 415,303 | 402,083 | 1,723,092 | 1,649,060 | 1,489,602
Income before income taxes | 103,894 | 103,713 | 100,596 | 89,376 | 97,242 | 94,467 | 72,272 | 80,264 | 397,579 | 344,245 | 250,216
Net income | 66,885 | 66,358 | 63,089 | 55,863 | 58,619 | 57,660 | 45,329 | 48,334 | 252,195 | 209,942 | 149,922
Net income available to common stockholders - diluted | $ 66,885 | $ 66,358 | $ 63,088 | $ 55,861 | $ 58,322 | $ 57,383 | $ 45,101 | $ 48,070 | $ 252,192 | $ 208,867 | $ 147,772
Basic net income per share | $ 0.49 | $ 0.49 | $ 0.46 | $ 0.41 | $ 0.43 | $ 0.42 | $ 0.33 | $ 0.34 | $ 1.85 | $ 1.51 | $ 1.05
Diluted net income per share | $ 0.49 | $ 0.48 | $ 0.46 | $ 0.40 | $ 0.42 | $ 0.41 | $ 0.32 | $ 0.34 | $ 1.83 | $ 1.50 | $ 1.04

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