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Income Taxes - Summary of Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current	$ 4us-gaap_CurrentIncomeTaxExpenseBenefit		$ (34)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	1,313us-gaap_DeferredIncomeTaxExpenseBenefit	297us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision (benefit)	$ 1,317us-gaap_IncomeTaxExpenseBenefit	$ 297us-gaap_IncomeTaxExpenseBenefit	$ (34)us-gaap_IncomeTaxExpenseBenefit

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

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