Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Earnings before income taxes	$ 56,817	$ 193,807
Canadian federal and provincial income tax rates	26.00%	26.00%
Income tax expense based on above rates	$ 14,772	$ 50,390
Non-deductible stock based compensation and other	2,206	4,001
Differences in tax rates in foreign jurisdictions	(16,605)	(72,898)
Impact of tax rate changes	(47)
Current period unrecognized temporary differences - impairments		16,874
Current period unrecognized temporary differences	3,602	5,658
Write down (reversal of write down) of previously recognized temporary differences	(4,814)	(5,355)
Income tax recovery	$ (886)	$ (1,330)

The applicable income tax rate.

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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