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Disclosure of Liability Classified Plans (Detail) - CAD ($) $ in Thousands	12 Months Ended
	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

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.

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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

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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

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- Definition

Current liabilities from share based payment transactions.

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Non-current liabilities from share based payment transactions.

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Payment of liabilities from share-based payment transactions.

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Reclassification from equity-settled plans.

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