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Selected Quarterly Financial Data (Unaudited) - Summary of Selected 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] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 915,361 us-gaap_SalesRevenueServicesNet | $ 913,386 us-gaap_SalesRevenueServicesNet | $ 893,930 us-gaap_SalesRevenueServicesNet | $ 848,449 us-gaap_SalesRevenueServicesNet | $ 885,252 us-gaap_SalesRevenueServicesNet | $ 882,981 us-gaap_SalesRevenueServicesNet | $ 836,685 us-gaap_SalesRevenueServicesNet | $ 768,980 us-gaap_SalesRevenueServicesNet | $ 3,571,126 us-gaap_SalesRevenueServicesNet | $ 3,373,898 us-gaap_SalesRevenueServicesNet | $ 3,124,108 us-gaap_SalesRevenueServicesNet
Gross margin | 89,910 us-gaap_GrossProfit | 93,196 us-gaap_GrossProfit | 98,585 us-gaap_GrossProfit | 88,744 us-gaap_GrossProfit | 95,088 us-gaap_GrossProfit | 93,124 us-gaap_GrossProfit | 95,473 us-gaap_GrossProfit | 87,338 us-gaap_GrossProfit | 370,435 us-gaap_GrossProfit | 371,023 us-gaap_GrossProfit | 356,066 us-gaap_GrossProfit
Operating income | 24,777 us-gaap_OperatingIncomeLoss | 7,677 us-gaap_OperatingIncomeLoss | 30,927 us-gaap_OperatingIncomeLoss | 20,496 us-gaap_OperatingIncomeLoss | 27,251 us-gaap_OperatingIncomeLoss | 31,295 us-gaap_OperatingIncomeLoss | 30,464 us-gaap_OperatingIncomeLoss | 24,737 us-gaap_OperatingIncomeLoss | 83,877 us-gaap_OperatingIncomeLoss | 113,747 us-gaap_OperatingIncomeLoss | 112,360 us-gaap_OperatingIncomeLoss
Net income | $ 16,356 us-gaap_NetIncomeLoss | $ 4,491 us-gaap_NetIncomeLoss | $ 18,676 us-gaap_NetIncomeLoss | $ 12,035 us-gaap_NetIncomeLoss | $ 16,536 us-gaap_NetIncomeLoss | $ 18,600 us-gaap_NetIncomeLoss | $ 18,610 us-gaap_NetIncomeLoss | $ 15,364 us-gaap_NetIncomeLoss | $ 51,558 us-gaap_NetIncomeLoss | $ 69,110 us-gaap_NetIncomeLoss | $ 67,953 us-gaap_NetIncomeLoss
Basic earnings per share | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.33 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 1.41 us-gaap_EarningsPerShareBasic | $ 1.88 us-gaap_EarningsPerShareBasic | $ 1.83 us-gaap_EarningsPerShareBasic
Diluted earnings per share | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 1.40 us-gaap_EarningsPerShareDiluted | $ 1.87 us-gaap_EarningsPerShareDiluted | $ 1.83 us-gaap_EarningsPerShareDiluted

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