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Income Taxes - Reconciliations of Income Tax Rates and Actual Tax Charge (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Net income (loss) before income taxes $ 38,352 $ (325,522) $ (372,131)
Net loss not subject to taxes (267,665) (129,307) (341,473)
Net income (loss) subject to taxes 306,017 (196,215) (30,658)
At applicable statutory tax rates 12,719 (15,808) (8,987)
Permanent and currency differences, adjustments to valuation allowances and uncertain tax positions (8,173) (2,817) 7,307
Other (1,675) 4,218 5,970
Income tax expense (recovery) related to the current year $ 2,872 $ (14,406) $ 4,290