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Disclosure of Liability Classified Plans (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Beginning balance $ 12,411 $ 21,869
Expensed during the period 8,193 6,390
Payments (7,092) (15,848)
Ending balance 13,512 12,411
Current 4,682  
Long-term 8,830 6,520
Restricted Share Units (RSUs) [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Beginning balance 5,409 6,950
Expensed during the period 5,755 5,223
Payments (3,846) (6,764)
Ending balance 7,318 5,409
Current 3,956  
Long-term 3,362  
Performance Share Units (PSUs) [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Beginning balance 4,521 11,407
Expensed during the period 1,583 398
Payments (3,246) (7,284)
Ending balance 2,858 4,521
Current 726  
Long-term 2,132  
Deferred Share Units (DSUs) [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Beginning balance 2,481 3,512
Expensed during the period 855 769
Payments   (1,800)
Ending balance 3,336 $ 2,481
Long-term $ 3,336