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