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

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

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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

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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

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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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