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Segmented information - Geographical segment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]    
Revenue $ 2,156,852 $ 2,431,404
Non-current assets, excluding deferred tax assets and financial instruments 4,261,904 4,858,896
Canada [member]    
Disclosure of geographical areas [line items]    
Revenue 316,611 347,536
Non-current assets, excluding deferred tax assets and financial instruments 3,417,254 3,665,558
Australia [Member]    
Disclosure of geographical areas [line items]    
Non-current assets, excluding deferred tax assets and financial instruments 422,400 420,448
United States [member]    
Disclosure of geographical areas [line items]    
Revenue 1,692,936 1,902,679
Non-current assets, excluding deferred tax assets and financial instruments 138,455 327,266
Kazakhstan [Member]    
Disclosure of geographical areas [line items]    
Non-current assets, excluding deferred tax assets and financial instruments 283,562 318,006
Germany [Member]    
Disclosure of geographical areas [line items]    
Revenue 147,305 181,189
Non-current assets, excluding deferred tax assets and financial instruments $ 233 $ 127,618