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Difference between Provision for Income Taxes and Amount Computed b Applying Federal (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Effective Tax Rate Reconciliation [Line Items]      
Provision for federal income taxes at the statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income taxes, net of Federal income tax benefit 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign rate differences (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Non-deductible expenses 6.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Reduction of deferred tax liabilities related to the prior year     (11.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Other (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Provision for income taxes 42.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 25.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations