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Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax (benefit) provision      
Federal $ (70)us-gaap_CurrentFederalTaxExpenseBenefit $ (113)us-gaap_CurrentFederalTaxExpenseBenefit $ (70)us-gaap_CurrentFederalTaxExpenseBenefit
State 937us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,086us-gaap_CurrentStateAndLocalTaxExpenseBenefit 542us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 5us-gaap_CurrentForeignTaxExpenseBenefit 13us-gaap_CurrentForeignTaxExpenseBenefit 31us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax provision 872us-gaap_CurrentIncomeTaxExpenseBenefit 986us-gaap_CurrentIncomeTaxExpenseBenefit 503us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax provision (benefit):      
Federal 30,414us-gaap_DeferredFederalIncomeTaxExpenseBenefit 28,628us-gaap_DeferredFederalIncomeTaxExpenseBenefit 36,030us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (2,414)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (3,900)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 907us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax provision 28,000us-gaap_DeferredIncomeTaxExpenseBenefit 24,728us-gaap_DeferredIncomeTaxExpenseBenefit 36,937us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision $ 28,872us-gaap_IncomeTaxExpenseBenefit $ 25,714us-gaap_IncomeTaxExpenseBenefit $ 37,440us-gaap_IncomeTaxExpenseBenefit