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Income Taxes - Components of Income Tax Expense (Benefit) (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]        
Current Federal alternative minimum tax ("AMT") expense   $ 92,000us-gaap_CurrentFederalTaxExpenseBenefit $ 42,000us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
Current state and local tax expense   254,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 132,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 187,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred Federal tax expense (benefit)   2,118,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (12,775,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (5,279,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred state and local tax expense (benefit)   (4,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (1,299,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (335,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Consolidated income tax expense (benefit), including taxes attributable to discontinued operations   2,460,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems (13,900,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems (5,427,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems
Income tax expense (benefit) attributable to discontinued operations   (382,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation (230,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income tax expense (benefit) (14,751,000)us-gaap_IncomeTaxExpenseBenefit 2,842,000us-gaap_IncomeTaxExpenseBenefit (13,670,069)us-gaap_IncomeTaxExpenseBenefit (5,427,000)us-gaap_IncomeTaxExpenseBenefit
Consolidated income tax expense (benefit), including taxes attributable to discontinued operations   $ 2,460,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems $ (13,900,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems $ (5,427,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems