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Income Tax Expense and Deferred Taxes - Summary of Temporary Difference (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 58,144 | $ 50,295
Deferred tax liabilities | 607,270 | 493,796
Expense (recovery) on the income statement | (19,849) | 9,039
Property, plant and equipment [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities | 592,062 | 482,530
Expense (recovery) on the income statement | (33,466) | 11,200
Loss carryforwards [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 31,457 | 15,436
Expense (recovery) on the income statement | (4,641) | (1,603)
Liabilities [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 24,690 | 20,864
Expense (recovery) on the income statement | (80) | (3,496)
Investment tax credits [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expense (recovery) on the income statement |  | 5,665
Other items [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 1,997 | 13,995
Deferred tax liabilities | 15,208 | 11,266
Expense (recovery) on the income statement | $ 18,338 | $ (2,727)

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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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