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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Statutory federal income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Tax benefit attributable to security gains (losses) $ 0us-gaap_GainLossOnInvestments $ 0us-gaap_GainLossOnInvestments
Liability for uncertain tax positions, current 0us-gaap_LiabilityForUncertainTaxPositionsCurrent  
Unrecognized tax benefits $ 0us-gaap_UnrecognizedTaxBenefits