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Income Taxes - Summary of Benefit (Provision) for Income Taxes from Continuing Operation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
United States federal									$ (218)us-gaap_CurrentFederalTaxExpenseBenefit	$ (300)us-gaap_CurrentFederalTaxExpenseBenefit	$ 91us-gaap_CurrentFederalTaxExpenseBenefit
Foreign									(12)us-gaap_CurrentForeignTaxExpenseBenefit	(12)us-gaap_CurrentForeignTaxExpenseBenefit	(902)us-gaap_CurrentForeignTaxExpenseBenefit
State and local									(75)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	(55)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	19us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current									(305)us-gaap_CurrentIncomeTaxExpenseBenefit	(367)us-gaap_CurrentIncomeTaxExpenseBenefit	(792)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
United States federal									(2,137)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	36,190us-gaap_DeferredFederalIncomeTaxExpenseBenefit	0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign									0us-gaap_DeferredForeignIncomeTaxExpenseBenefit	660us-gaap_DeferredForeignIncomeTaxExpenseBenefit	0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local									246us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred									(1,891)us-gaap_DeferredIncomeTaxExpenseBenefit	36,850us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Total	$ (422)us-gaap_IncomeTaxExpenseBenefit	$ (599)us-gaap_IncomeTaxExpenseBenefit	$ (92)us-gaap_IncomeTaxExpenseBenefit	$ (1,083)us-gaap_IncomeTaxExpenseBenefit	$ 36,767us-gaap_IncomeTaxExpenseBenefit	$ (257)us-gaap_IncomeTaxExpenseBenefit	$ (10)us-gaap_IncomeTaxExpenseBenefit	$ (17)us-gaap_IncomeTaxExpenseBenefit	$ (2,196)us-gaap_IncomeTaxExpenseBenefit	$ 36,483us-gaap_IncomeTaxExpenseBenefit	$ (792)us-gaap_IncomeTaxExpenseBenefit

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