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Summary of Activity Under Non Management Director DSU Plans (Detail) - shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred Share Units (DSUs) [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 116,280 118,774
Granted 7,193 16,336
Redeemed   (18,830)
Ending balance 123,473 116,280
Deferred Share Units 2012 Plan [Member] | Non-Management Director [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance 1,470 1,470
Ending balance 1,470 1,470
Deferred Share Units 2024 Plan [Member] | Non-Management Director [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Granted 6,777  
Redeemed (4,024)  
Ending balance 2,753