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Stock-Based Compensation - Schedule of Other Equity Instruments (Detail) - Deferred Share Units [Member] - Board of Director [Member] - Equity | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |
Beginning balance | 2,645,000 | 2,682,000
Issued | 141,000 | 156,000
Reinvested | 98,000 | 88,000
Redeemed | (346,000) | (279,000)
Forfeitures and cancellations |  | (2,000)
Ending balance | 2,538,000 | 2,645,000

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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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