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Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income taxes:      
Federal $ (94,983,000)us-gaap_CurrentFederalTaxExpenseBenefit $ (52,601,000)us-gaap_CurrentFederalTaxExpenseBenefit $ 77,909,000us-gaap_CurrentFederalTaxExpenseBenefit
State 1,255,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit (9,477,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 18,400,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 723,000us-gaap_CurrentForeignTaxExpenseBenefit 6,000us-gaap_CurrentForeignTaxExpenseBenefit 538,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax expense (benefit) (93,005,000)us-gaap_CurrentIncomeTaxExpenseBenefit (62,072,000)us-gaap_CurrentIncomeTaxExpenseBenefit 96,847,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income taxes:      
Federal 54,015,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 15,051,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (631,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 6,894,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 4,696,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (8,271,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax expense (benefit) 60,909,000us-gaap_DeferredIncomeTaxExpenseBenefit 19,747,000us-gaap_DeferredIncomeTaxExpenseBenefit (8,902,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit) (32,096,000)us-gaap_IncomeTaxExpenseBenefit (42,325,000)us-gaap_IncomeTaxExpenseBenefit 87,945,000us-gaap_IncomeTaxExpenseBenefit
Income tax benefit related to discontinued operation $ 900,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 431,000,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 80,400,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation