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Income Taxes - Components of Provision 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 $ (6,460)us-gaap_CurrentIncomeTaxExpenseBenefit $ 2,742us-gaap_CurrentIncomeTaxExpenseBenefit $ 9,167us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (3,713)us-gaap_DeferredIncomeTaxExpenseBenefit (5,614)us-gaap_DeferredIncomeTaxExpenseBenefit 5,239us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (expense) recovery $ (10,173)us-gaap_IncomeTaxExpenseBenefit $ (2,872)us-gaap_IncomeTaxExpenseBenefit $ 14,406us-gaap_IncomeTaxExpenseBenefit