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Schedule of Issued Capital (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]    
Beginning balance, shares 13,304,425 13,459,593
Share repurchase (130,395) (155,168)
Settlement of Executive PSUs, shares (14,083)  
Share options exercised, shares 120,595  
Ending balance, shares 13,558,525 13,304,425
Beginning balance $ 2,281,444 $ 2,285,738
Share repurchase (10,010) (4,294)
Share options exercised 14,016  
Ending balance $ 2,299,533 $ 2,281,444
Performance Share Units (PSUs) [Member]    
Disclosure of classes of share capital [line items]    
Settlement of Executive PSUs, shares 263,900  
Settlement of Executive PSUs $ 14,083