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Schedule of Issued Capital (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]    
Beginning balance, shares 13,558,525 13,304,425
Share repurchase (412,623) (130,395)
Issue of shares on business acquisition 947,807  
Redemption of non-management directors share units 12,494  
Share options exercised, shares   120,595
Ending balance, shares 14,336,539 13,558,525
Beginning balance $ 2,299,533 $ 2,281,444
Share repurchase (29,955) (10,010)
Issue of shares on business acquisition, value 75,588  
Redemption of non-management directors share units 757  
Share options exercised   14,016
Ending balance $ 2,365,129 $ 2,299,533
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
Performance Share Units (PSUs) and Restricted Share Units (RSUs) [Member]    
Disclosure of classes of share capital [line items]    
Settlement of PSUs and RSUs, shares 230,336  
Settlement of PSUs and RSUs $ 19,206