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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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,221,450 us-gaap_SalesRevenueServicesNet | $ 1,224,308 us-gaap_SalesRevenueServicesNet | $ 1,164,914 us-gaap_SalesRevenueServicesNet | $ 1,084,342 us-gaap_SalesRevenueServicesNet | $ 1,083,864 us-gaap_SalesRevenueServicesNet | $ 1,075,119 us-gaap_SalesRevenueServicesNet | $ 1,063,228 us-gaap_SalesRevenueServicesNet | $ 1,023,684 us-gaap_SalesRevenueServicesNet | $ 4,695,014 us-gaap_SalesRevenueServicesNet | $ 4,245,895 us-gaap_SalesRevenueServicesNet | $ 4,111,213 us-gaap_SalesRevenueServicesNet
Gross margin | 500,757 us-gaap_GrossProfit | 505,220 us-gaap_GrossProfit | 478,444 us-gaap_GrossProfit | 438,495 us-gaap_GrossProfit | 443,216 us-gaap_GrossProfit | 437,478 us-gaap_GrossProfit | 432,108 us-gaap_GrossProfit | 410,290 us-gaap_GrossProfit | 1,922,916 us-gaap_GrossProfit | 1,723,092 us-gaap_GrossProfit | 1,649,060 us-gaap_GrossProfit
Income before income taxes | 133,321 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 138,361 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 123,653 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 102,014 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 103,894 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 103,713 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 100,596 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 89,376 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 497,349 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 397,579 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 344,245 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | 84,053 us-gaap_NetIncomeLoss | 85,184 us-gaap_NetIncomeLoss | 75,140 us-gaap_NetIncomeLoss | 61,551 us-gaap_NetIncomeLoss | 66,885 us-gaap_NetIncomeLoss | 66,358 us-gaap_NetIncomeLoss | 63,089 us-gaap_NetIncomeLoss | 55,863 us-gaap_NetIncomeLoss | 305,928 us-gaap_NetIncomeLoss | 252,195 us-gaap_NetIncomeLoss | 209,942 us-gaap_NetIncomeLoss
Net income available to common stockholders - diluted | $ 84,053 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 85,184 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 75,140 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 61,551 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 66,885 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 66,358 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 63,088 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 55,861 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 305,928 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 252,192 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 208,867 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Basic net income per share | $ 0.63 us-gaap_EarningsPerShareBasic | $ 0.64 us-gaap_EarningsPerShareBasic | $ 0.56 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic | $ 2.28 us-gaap_EarningsPerShareBasic | $ 1.85 us-gaap_EarningsPerShareBasic | $ 1.51 us-gaap_EarningsPerShareBasic
Diluted net income per share | $ 0.62 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 2.26 us-gaap_EarningsPerShareDiluted | $ 1.83 us-gaap_EarningsPerShareDiluted | $ 1.50 us-gaap_EarningsPerShareDiluted

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