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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2015
Dec. 31, 2011
Subsequent Event [Line Items]          
Federal net operating loss carryforward         $ 31,200,000us-gaap_OperatingLossCarryforwards
Estimated tax deferral 126,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses        
Uncertain tax benefits that, if recognized, would affect effective tax rate 2,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,500,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Recognized interest and penalties related to unrecognized tax benefits 286,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 76,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 126,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense    
Accrued interest and penalties 499,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 278,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued      
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Proceeds from refund of overpaid federal tax       $ 100,000,000us-gaap_ProceedsFromIncomeTaxRefunds
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