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Income taxes - Summary of Temporary Difference (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 84,043 | $ 58,144
Deferred tax liabilities | 513,972 | 607,270
Expense (recovery) | (118,839) | (19,849)
Property, plant and equipment [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities | 483,561 | 592,062
Expense (recovery) | (108,501) | (33,466)
Loss carryforwards [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 37,245 | 31,457
Expense (recovery) | (5,788) | (4,641)
Liabilities [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 27,321 | 24,690
Expense (recovery) | (2,631) | (80)
Investment tax credits [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities | 20,000 | 0
Expense (recovery) | 20,000 | 0
Other items [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 19,477 | 1,997
Deferred tax liabilities | 10,411 | 15,208
Expense (recovery) | $ (21,919) | $ 18,338

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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 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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