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