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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenues | $ 430,045 us-gaap_SalesRevenueServicesNet | $ 406,851 us-gaap_SalesRevenueServicesNet
Cost of services | 294,170 us-gaap_CostOfServices | 278,696 us-gaap_CostOfServices
Gross profit | 135,875 us-gaap_GrossProfit | 128,155 us-gaap_GrossProfit
Selling, general and administrative expenses | 105,935 us-gaap_SellingGeneralAndAdministrativeExpense | 96,109 us-gaap_SellingGeneralAndAdministrativeExpense
Amortization of intangible assets | 4,869 us-gaap_AmortizationOfIntangibleAssets | 5,538 us-gaap_AmortizationOfIntangibleAssets
Operating income | 25,071 us-gaap_OperatingIncomeLoss | 26,508 us-gaap_OperatingIncomeLoss
Interest expense, net | (3,067)us-gaap_InterestExpense | (3,328)us-gaap_InterestExpense
Income before income taxes | 22,004 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 23,180 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes | 8,981 us-gaap_IncomeTaxExpenseBenefit | 9,575 us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations | 13,023 us-gaap_IncomeLossFromContinuingOperations | 13,605 us-gaap_IncomeLossFromContinuingOperations
Gain on sale of discontinued operations, net of income taxes | 25,703 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Income from discontinued operations, net of income taxes | 409 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 312 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income | 39,135 us-gaap_NetIncomeLoss | 13,917 us-gaap_NetIncomeLoss
Basic earnings per common share: |  |
Income from continuing operations | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ 0.51 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income | $ 0.76 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic
Diluted earnings per common share: |  |
Income from continuing operations | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ 0.50 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income | $ 0.75 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted
Number of shares and share equivalents used to calculate earnings per share: |  |
Basic | 51,519 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 54,104 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 52,209 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 54,975 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Reconciliation of net income to comprehensive income: |  |
Net income | 39,135 us-gaap_NetIncomeLoss | 13,917 us-gaap_NetIncomeLoss
Changes in fair value of derivatives, net of tax | 47 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 44 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Foreign currency translation adjustment, net of tax | (3,724)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (44)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Comprehensive income | $ 35,458 us-gaap_ComprehensiveIncomeNetOfTax | $ 13,917 us-gaap_ComprehensiveIncomeNetOfTax

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