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Disclosure of Liability Classified Plans (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | $ 21,869 | $ 49,242
Expensed (recovered) during the period | 6,390 | (3,166)
Payments | (15,848) | (24,207)
Ending balance | 12,411 | 21,869
Current | 5,891 |
Long-term | 6,520 | 13,536
Restricted Share Units (RSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 6,950 | 15,592
Expensed (recovered) during the period | 5,223 | 2,115
Payments | (6,764) | (10,757)
Ending balance | 5,409 | 6,950
Current | 3,112 |
Long-term | 2,297 |
Performance Share Units (PSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 11,407 | 29,045
Expensed (recovered) during the period | 398 | (4,188)
Payments | (7,284) | (13,450)
Ending balance | 4,521 | 11,407
Current | 2,779 |
Long-term | 1,742 |
Share Appreciation Rights [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance |  | 3
Expensed (recovered) during the period |  | (3)
Deferred Share Units (DSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 3,512 | 4,602
Expensed (recovered) during the period | 769 | (1,090)
Payments | (1,800) |
Ending balance | 2,481 | $ 3,512
Long-term | $ 2,481 |

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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_b_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Current liabilities from share based payment transactions. + References No definition available. + Details
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- Definition Payment of liabilities from share-based payment transactions. + References No definition available. + Details
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