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Income Taxes - Reconciliations of Income Tax Rates and Actual Tax Charge (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Net (loss) income before income taxes $ (516,840) $ 111,132 $ 388,693
Net (loss) income not subject to taxes (297,688) 57,862 252,604
Net (loss) income subject to taxes (219,152) 53,270 136,089
At applicable statutory tax rates (51,471) 5,996 32,750
Permanent and currency differences, adjustments to valuation allowances and uncertain tax positions 64,164 18,198 (49,789)
Other (461) 274 272
Tax expense (recovery) related to the year $ 12,232 $ 24,468 $ (16,767)