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Income Taxes - Components of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current	$ (137)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (1,717)us-gaap_CurrentIncomeTaxExpenseBenefit	$ 1,425us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(3,277)	(484)	(1,517)
Change in valuation allowance	8,140
Total deferred	4,863us-gaap_DeferredIncomeTaxExpenseBenefit	(484)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,517)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit)	$ 4,726us-gaap_IncomeTaxExpenseBenefit	$ (2,201)us-gaap_IncomeTaxExpenseBenefit	$ (92)us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable 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.