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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Statement [Abstract] |  |  |
Revenues | $ 7,851,250 us-gaap_SalesRevenueServicesNet | $ 6,522,842 us-gaap_SalesRevenueServicesNet | $ 5,920,269 us-gaap_SalesRevenueServicesNet
Cost of services (including depreciation) | 6,617,730 us-gaap_CostOfServices | 5,467,389 us-gaap_CostOfServices | 4,982,562 us-gaap_CostOfServices
Gross profit | 1,233,520 us-gaap_GrossProfit | 1,055,453 us-gaap_GrossProfit | 937,707 us-gaap_GrossProfit
Selling, general and administrative expenses | 722,038 us-gaap_SellingGeneralAndAdministrativeExpense | 501,010 us-gaap_SellingGeneralAndAdministrativeExpense | 434,894 us-gaap_SellingGeneralAndAdministrativeExpense
Amortization of intangible assets | 35,907 us-gaap_AmortizationOfIntangibleAssets | 27,515 us-gaap_AmortizationOfIntangibleAssets | 37,691 us-gaap_AmortizationOfIntangibleAssets
Operating income | 475,575 us-gaap_OperatingIncomeLoss | 526,928 us-gaap_OperatingIncomeLoss | 465,122 us-gaap_OperatingIncomeLoss
Interest expense | (4,765)us-gaap_InterestExpense | (2,668)us-gaap_InterestExpense | (3,746)us-gaap_InterestExpense
Interest income | 3,741 us-gaap_InvestmentIncomeInterest | 3,380 us-gaap_InvestmentIncomeInterest | 1,471 us-gaap_InvestmentIncomeInterest
Equity in earnings (losses) of unconsolidated affiliates, including gain on sale of investment | (332)us-gaap_IncomeLossFromEquityMethodInvestments | 112,744 us-gaap_IncomeLossFromEquityMethodInvestments | 2,084 us-gaap_IncomeLossFromEquityMethodInvestments
Other income (expense), net | (1,102)us-gaap_OtherNonoperatingIncomeExpense | (1,135)us-gaap_OtherNonoperatingIncomeExpense | (351)us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before income taxes | 473,117 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 639,249 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 464,580 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes | 157,408 us-gaap_IncomeTaxExpenseBenefit | 217,940 us-gaap_IncomeTaxExpenseBenefit | 158,859 us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations | 315,709 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 421,309 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 305,721 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations, net of taxes | (627)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 16,935 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income | 315,082 us-gaap_ProfitLoss | 421,309 us-gaap_ProfitLoss | 322,656 us-gaap_ProfitLoss
Less: Net income attributable to non-controlling interests | 18,368 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 19,388 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 16,027 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to common stock | 296,714 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 401,921 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 306,629 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Amounts attributable to common stock: |  |  |
Net income from continuing operations | 297,341 us-gaap_IncomeLossFromContinuingOperations | 401,921 us-gaap_IncomeLossFromContinuingOperations | 289,694 us-gaap_IncomeLossFromContinuingOperations
Net income (loss) from discontinued operations | (627)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 16,935 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income attributable to common stock | $ 296,714 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 401,921 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 306,629 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share attributable to common stock - basic and diluted: |  |  |
Continuing operations | $ 1.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 1.87 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 1.36 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Discontinued operations |  |  | $ 0.08 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Net income attributable to common stock | $ 1.35 us-gaap_EarningsPerShareBasicAndDiluted | $ 1.87 us-gaap_EarningsPerShareBasicAndDiluted | $ 1.44 us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing earnings per share: |  |  |
Weighted average basic shares outstanding | 219,668 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 214,929 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 212,777 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average diluted shares outstanding | 219,690 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 214,978 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 212,835 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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