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Disclosure of Liability Classified Plans (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | $ 13,512 | $ 12,411
Expensed during the period | 4,355 | 8,193
Reclassification from equity-settled plans | 6,833 |
Payments | (4,883) | (7,092)
Ending balance | 19,817 | 13,512
Current | 8,310 |
Long-term | 11,507 | 8,830
Restricted Share Units (RSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 7,318 | 5,409
Expensed during the period | 3,119 | 5,755
Payments | (3,813) | (3,846)
Ending balance | 6,624 | 7,318
Current | 4,212 |
Long-term | 2,412 |
Performance Share Units (PSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 2,858 | 4,521
Expensed during the period | 2,787 | 1,583
Payments | (894) | (3,246)
Ending balance | 4,751 | 2,858
Current | 1,120 |
Long-term | 3,631 |
Executive Performance Share Units [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Reclassification from equity-settled plans | 6,833 |
Ending balance | 6,833 |
Current | 2,978 |
Long-term | 3,855 |
Deferred Share Units (DSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 3,336 | 2,481
Expensed during the period | (1,551) | 855
Payments | (176) |
Ending balance | 1,609 | $ 3,336
Long-term | $ 1,609 |

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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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