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Disclosure of Liability Classified Plans (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | $ 12,411 | $ 21,869
Expensed during the period | 8,193 | 6,390
Payments | (7,092) | (15,848)
Ending balance | 13,512 | 12,411
Current | 4,682 |
Long-term | 8,830 | 6,520
Restricted Share Units (RSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 5,409 | 6,950
Expensed during the period | 5,755 | 5,223
Payments | (3,846) | (6,764)
Ending balance | 7,318 | 5,409
Current | 3,956 |
Long-term | 3,362 |
Performance Share Units (PSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 4,521 | 11,407
Expensed during the period | 1,583 | 398
Payments | (3,246) | (7,284)
Ending balance | 2,858 | 4,521
Current | 726 |
Long-term | 2,132 |
Deferred Share Units (DSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 2,481 | 3,512
Expensed during the period | 855 | 769
Payments |  | (1,800)
Ending balance | 3,336 | $ 2,481
Long-term | $ 3,336 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Non-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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