Income Taxes - Components of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 345us-gaap_CurrentFederalTaxExpenseBenefit	$ (462)us-gaap_CurrentFederalTaxExpenseBenefit
State	262	266
Total current	607us-gaap_CurrentIncomeTaxExpenseBenefit	(196)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	13,134	6,549
State	103	465
Total deferred	13,237us-gaap_DeferredIncomeTaxExpenseBenefit	7,014us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision	$ 13,844us-gaap_IncomeTaxExpenseBenefit	$ 6,818us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.