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Joint operations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of joint operations [line items]    
Total assets $ 7,778,727 $ 8,249,198
Joint operations [member]    
Disclosure of joint operations [line items]    
Total assets 3,365,818 3,546,048
Total liabilities $ 339,795 413,069
McArthur River [Member]    
Disclosure of joint operations [line items]    
Ownership 69.81%  
Principal place of business Canada  
Total assets $ 1,121,509 1,093,254
Total liabilities $ 38,896 43,189
Key Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 83330.00%  
Principal place of business Canada  
Total assets $ 482,879 571,183
Total liabilities $ 140,214 150,847
Cigar Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 50030.00%  
Principal place of business Canada  
Total assets $ 1,531,150 1,591,489
Total liabilities $ 40,687 37,888
Inkai [Member]    
Disclosure of joint operations [line items]    
Ownership 60000.00%  
Principal place of business Kazakhstan  
Total assets $ 230,280 290,122
Total liabilities $ 119,998 $ 181,145
Percentage of interest in advances receivable 40.00%