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Interests in Resource Properties - exploration and evaluation assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Movements In Exploration And Evaluation Assets [Roll Forward]    
Opening balance $ 201,802  
Ending balance 196,634 $ 201,802
Hydrocarbon Probable Reserves    
Disclosure Of Movements In Exploration And Evaluation Assets [Roll Forward]    
Opening balance 0 12,367
Reclassification to assets held for sale 0 (12,367)
Ending balance 0 0
Hydrocarbon Undeveloped lands    
Disclosure Of Movements In Exploration And Evaluation Assets [Roll Forward]    
Opening balance 0 4,640
Reclassification to assets held for sale 0 (4,640)
Ending balance $ 0 $ 0