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Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax Rate as Percentage of Income Before Income Taxes (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income tax expense computed at the statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
IRC Sec. 162(m) limitation (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Tax deficits on stock compensation (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost    
Other (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations