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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Income taxes, net $ 15,693us-gaap_IncomeTaxExpenseBenefit $ 9,568us-gaap_IncomeTaxExpenseBenefit
Effective tax rate 41.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 41.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations
U.S. federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate