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INCOME TAXES - Components of Federal Income Tax Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current year provision (benefit):      
Federal $ 81us-gaap_CurrentFederalTaxExpenseBenefit $ 60us-gaap_CurrentFederalTaxExpenseBenefit $ (12,383)us-gaap_CurrentFederalTaxExpenseBenefit
State 10us-gaap_CurrentStateAndLocalTaxExpenseBenefit (266)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (46)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit) 91us-gaap_CurrentIncomeTaxExpenseBenefit (206)us-gaap_CurrentIncomeTaxExpenseBenefit (12,429)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit)      
Federal 2,723us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,253us-gaap_DeferredFederalIncomeTaxExpenseBenefit 143us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 18us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 18us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 6us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax expense (benefit) 2,741us-gaap_DeferredIncomeTaxExpenseBenefit 1,271us-gaap_DeferredIncomeTaxExpenseBenefit 149us-gaap_DeferredIncomeTaxExpenseBenefit
Change in valuation allowance on deferred taxes (18,964)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (1,271)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 20,235us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Net federal income tax expense (benefit) $ (16,132)us-gaap_IncomeTaxExpenseBenefit $ (206)us-gaap_IncomeTaxExpenseBenefit $ 7,955us-gaap_IncomeTaxExpenseBenefit