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Segmented information - Geographical segment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Revenue $ 2,091,661 $ 2,156,852
Non-current assets, excluding deferred tax assets and financial instruments 3,947,528 4,261,904
Canada [member]    
Disclosure of geographical areas [line items]    
Revenue 424,079 316,611
Non-current assets, excluding deferred tax assets and financial instruments 3,401,828 3,417,254
Australia [Member]    
Disclosure of geographical areas [line items]    
Non-current assets, excluding deferred tax assets and financial instruments 414,084 422,400
United States [Member]    
Disclosure of geographical areas [line items]    
Revenue 1,660,727 1,692,936
Non-current assets, excluding deferred tax assets and financial instruments 131,526 138,455
Kazakhstan [Member]    
Disclosure of geographical areas [line items]    
Non-current assets, excluding deferred tax assets and financial instruments 49 283,562
Germany [Member]    
Disclosure of geographical areas [line items]    
Revenue 2,817 147,305
Non-current assets, excluding deferred tax assets and financial instruments 41 233
Switzerland [Member]    
Disclosure of geographical areas [line items]    
Revenue $ 4,038 $ 0