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Income Tax Expense and Deferred Taxes - Summary of Income Tax Expense (Recovery) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Major components of tax expense (income) [abstract]
Current tax expense	$ 39,232	$ 47,166
Deferred tax expense (recovery)	(19,849)	9,039
Income tax expense	$ 19,383	$ 56,205

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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