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Quarterly Financial Data (Unaudited) - Consolidated Operating Results by Quarter (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] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,052,982 us-gaap_SalesRevenueServicesNet | $ 2,171,144 us-gaap_SalesRevenueServicesNet | $ 1,864,550 us-gaap_SalesRevenueServicesNet | $ 1,762,574 us-gaap_SalesRevenueServicesNet | $ 1,817,623 us-gaap_SalesRevenueServicesNet | $ 1,645,132 us-gaap_SalesRevenueServicesNet | $ 1,474,377 us-gaap_SalesRevenueServicesNet | $ 1,585,710 us-gaap_SalesRevenueServicesNet | $ 7,851,250 us-gaap_SalesRevenueServicesNet | $ 6,522,842 us-gaap_SalesRevenueServicesNet | $ 5,920,269 us-gaap_SalesRevenueServicesNet
Gross profit | 327,030 us-gaap_GrossProfit | 352,971 us-gaap_GrossProfit | 281,448 us-gaap_GrossProfit | 272,071 us-gaap_GrossProfit | 302,843 us-gaap_GrossProfit | 273,053 us-gaap_GrossProfit | 241,284 us-gaap_GrossProfit | 238,273 us-gaap_GrossProfit | 1,233,520 us-gaap_GrossProfit | 1,055,453 us-gaap_GrossProfit | 937,707 us-gaap_GrossProfit
Net income | 70,975 us-gaap_ProfitLoss | 100,015 us-gaap_ProfitLoss | 85,444 us-gaap_ProfitLoss | 58,648 us-gaap_ProfitLoss | 171,317 us-gaap_ProfitLoss | 98,409 us-gaap_ProfitLoss | 74,726 us-gaap_ProfitLoss | 76,857 us-gaap_ProfitLoss | 315,082 us-gaap_ProfitLoss | 421,309 us-gaap_ProfitLoss | 322,656 us-gaap_ProfitLoss
Net income attributable to common stock | 66,576 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 94,648 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 81,082 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 54,408 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 166,697 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 92,906 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 70,237 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 72,081 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 296,714 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 401,921 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 306,629 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income from continuing operations | $ 67,203 us-gaap_IncomeLossFromContinuingOperations | $ 94,648 us-gaap_IncomeLossFromContinuingOperations | $ 81,082 us-gaap_IncomeLossFromContinuingOperations | $ 54,408 us-gaap_IncomeLossFromContinuingOperations | $ 166,697 us-gaap_IncomeLossFromContinuingOperations | $ 92,906 us-gaap_IncomeLossFromContinuingOperations | $ 70,237 us-gaap_IncomeLossFromContinuingOperations | $ 72,081 us-gaap_IncomeLossFromContinuingOperations | $ 297,341 us-gaap_IncomeLossFromContinuingOperations | $ 401,921 us-gaap_IncomeLossFromContinuingOperations | $ 289,694 us-gaap_IncomeLossFromContinuingOperations
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.43 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.77 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.43 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 1.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 1.87 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 1.36 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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