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Income Taxes - Reconciliations of Income Tax Rates and Actual Tax Charge (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Net loss before income taxes | $ (123,504) | $ (38,023) | $ (516,840)
Net loss not subject to taxes | (91,925) | (104,465) | (297,688)
Net (loss) income subject to taxes | (31,579) | 66,442 | (219,152)
At applicable statutory tax rates | (4,352) | 15,177 | (51,471)
Permanent and currency differences, adjustments to valuation allowances and uncertain tax positions | 25,177 | 4,639 | 64,164
Other | 4,657 | (92) | (461)
Tax expense related to the year | $ 25,482 | $ 19,724 | $ 12,232

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