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Income Taxes - Provision (Benefit) for 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 tax expense (benefit)	$ 1,528us-gaap_CurrentIncomeTaxExpenseBenefit	$ (44)us-gaap_CurrentIncomeTaxExpenseBenefit	$ 965us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit)	1,971us-gaap_DeferredIncomeTaxExpenseBenefit	(4,776)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit)	$ 3,499us-gaap_IncomeTaxExpenseBenefit	$ (4,820)us-gaap_IncomeTaxExpenseBenefit	$ 965us-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.