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Interests in Resource Properties - exploration and evaluation assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Movements In Exploration And Evaluation Assets [Roll Forward]    
Opening balance $ 254,706  
Ending balance 201,802 $ 254,706
Hydrocarbon Probable Reserves    
Disclosure Of Movements In Exploration And Evaluation Assets [Roll Forward]    
Opening balance 12,367 12,367
Reclassification to assets held for sale (12,367) 0
Ending balance 0 12,367
Hydrocarbon Undeveloped lands    
Disclosure Of Movements In Exploration And Evaluation Assets [Roll Forward]    
Opening balance 4,640 4,640
Reclassification to assets held for sale (4,640) 0
Ending balance $ 0 $ 4,640