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Variations from Federal Statutory Rate (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation Of Income Taxes [Line Items]      
Expected federal income tax expense (benefit), statutory rate Effective?Income?Tax?Rate?Reconciliation?At?Federal?Statutory?Income?Tax?Rate 34 34 34 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate