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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (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 | $ 1,724,741 us-gaap_SalesRevenueServicesNet | $ 1,523,101 us-gaap_SalesRevenueServicesNet | $ 1,031,935 us-gaap_SalesRevenueServicesNet
Cost of services | 1,167,306 us-gaap_CostOfServices | 1,068,226 us-gaap_CostOfServices | 710,681 us-gaap_CostOfServices
Gross profit | 557,435 us-gaap_GrossProfit | 454,875 us-gaap_GrossProfit | 321,254 us-gaap_GrossProfit
Selling, general and administrative expenses | 397,523 us-gaap_SellingGeneralAndAdministrativeExpense | 317,345 us-gaap_SellingGeneralAndAdministrativeExpense | 231,194 us-gaap_SellingGeneralAndAdministrativeExpense
Amortization of intangible assets | 22,130 us-gaap_AmortizationOfIntangibleAssets | 20,943 us-gaap_AmortizationOfIntangibleAssets | 17,047 us-gaap_AmortizationOfIntangibleAssets
Operating income | 137,782 us-gaap_OperatingIncomeLoss | 116,587 us-gaap_OperatingIncomeLoss | 73,013 us-gaap_OperatingIncomeLoss
Interest expense, net | (12,730)us-gaap_InterestExpense | (13,931)us-gaap_InterestExpense | (12,595)us-gaap_InterestExpense
Write-off of loan costs | 0 us-gaap_WriteOffOfDeferredDebtIssuanceCost | (14,958)us-gaap_WriteOffOfDeferredDebtIssuanceCost | (813)us-gaap_WriteOffOfDeferredDebtIssuanceCost
Income before income taxes | 125,052 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 87,698 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 59,605 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes | 51,557 us-gaap_IncomeTaxExpenseBenefit | 36,558 us-gaap_IncomeTaxExpenseBenefit | 26,142 us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations | 73,495 us-gaap_IncomeLossFromContinuingOperations | 51,140 us-gaap_IncomeLossFromContinuingOperations | 33,463 us-gaap_IncomeLossFromContinuingOperations
Gain on sale of discontinued operations, net of income taxes | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 30,840 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | 3,689 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 2,532 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 9,190 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income | 77,184 us-gaap_NetIncomeLoss | 84,512 us-gaap_NetIncomeLoss | 42,653 us-gaap_NetIncomeLoss
Basic earnings per common share: |  |  |
Continuing operations | $ 1.38 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.96 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.72 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.62 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.19 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income | $ 1.44 us-gaap_EarningsPerShareBasic | $ 1.58 us-gaap_EarningsPerShareBasic | $ 0.91 us-gaap_EarningsPerShareBasic
Diluted earnings per common share: |  |  |
Continuing operations | $ 1.35 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.94 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.70 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.61 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.19 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income | $ 1.42 us-gaap_EarningsPerShareDiluted | $ 1.55 us-gaap_EarningsPerShareDiluted | $ 0.89 us-gaap_EarningsPerShareDiluted
Number of shares and share equivalents used to calculate earnings per share: |  |  |
Basic (in shares) | 53,437 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 53,481 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46,739 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 54,294 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 54,555 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 47,826 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Reconciliation of net income to comprehensive income: |  |  |
Net income | 77,184 us-gaap_NetIncomeLoss | 84,512 us-gaap_NetIncomeLoss | 42,653 us-gaap_NetIncomeLoss
Changes in fair value of derivative, net of tax | 86 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 193 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | (21)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (4,772)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 1,128 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 854 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive income | $ 72,498 us-gaap_ComprehensiveIncomeNetOfTax | $ 85,833 us-gaap_ComprehensiveIncomeNetOfTax | $ 43,486 us-gaap_ComprehensiveIncomeNetOfTax

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