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Disclosure of Liability Classified Plans (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning balance	$ 49,242	$ 32,472
Expensed (recovered) during the period	(3,166)	32,024
Payments	(24,207)	(15,254)
Ending balance	21,869	49,242
Current	8,333
Long-term	13,536	27,387
Restricted Share Units (RSUs) [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning balance	15,592	10,459
Expensed (recovered) during the period	2,115	10,888
Payments	(10,757)	(5,755)
Ending balance	6,950	15,592
Current	4,719
Long-term	2,231
Performance Share Units (PSUs) [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning balance	29,045	19,624
Expensed (recovered) during the period	(4,188)	18,920
Payments	(13,450)	(9,499)
Ending balance	11,407	29,045
Current	3,614
Long-term	7,793
Share Appreciation Rights [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning balance	3	6
Expensed (recovered) during the period	(3)	(3)
Ending balance		3
Deferred Share Units (DSUs) [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning balance	4,602	2,383
Expensed (recovered) during the period	(1,090)	2,219
Ending balance	3,512	$ 4,602
Long-term	$ 3,512

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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 2016-01-13
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

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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 2016-01-13
-Paragraph 51
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_51_b_i&doctype=Standard
-URIDate 2016-03-31

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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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