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Income Taxes - Reconciliation Of Federal Statutory Rate To Effective Income Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increases in the rate resulting from:      
State income taxes, net of federal income tax impact 5.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign income taxes 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent 3.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 47.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations