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Segment disclosure - Disclosure of main assets and liabilities per operating segment (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Cash $ 115,698 $ 302,524 $ 108,223
Current assets 152,926 335,188  
Investments in associates and other investments 294,364 276,733  
Royalty, stream and other interests 1,154,801 1,116,128  
Mining interests and plant and equipment 635,655 489,512 343,693
Exploration and evaluation assets 3,635 42,519 42,949
Goodwill 111,204 111,204  
Total assets 2,370,622 2,397,104  
Total liabilities (excluding long-term debt) 180,126 155,643  
Long-term debt 410,435 400,429 $ 349,042
Royalties, streams and similar interests [Member]      
Disclosure of operating segments [line items]      
Cash 82,291 105,097  
Current assets 91,594 117,592  
Investments in associates and other investments 231,884 166,589  
Royalty, stream and other interests 1,247,489 1,203,781  
Mining interests and plant and equipment 7,991 9,011  
Exploration and evaluation assets 0 0  
Goodwill 111,204 111,204  
Total assets 1,691,958 1,609,344  
Total liabilities (excluding long-term debt) 89,416 67,449  
Long-term debt 406,671 400,429  
Mining exploration, evaluation and development [Member]      
Disclosure of operating segments [line items]      
Cash 33,407 197,427  
Current assets 61,422 218,478  
Investments in associates and other investments 62,480 110,144  
Royalty, stream and other interests 0 0  
Mining interests and plant and equipment 559,332 407,000  
Exploration and evaluation assets 3,635 41,869  
Goodwill 0 0  
Total assets 703,110 802,144  
Total liabilities (excluding long-term debt) 115,156 102,578  
Long-term debt 3,764 0  
Intersegment transactions (Member)      
Disclosure of operating segments [line items]      
Cash 0 0  
Current assets (90) (882)  
Investments in associates and other investments 0 0  
Royalty, stream and other interests (92,688) (87,653)  
Mining interests and plant and equipment 68,332 73,501  
Exploration and evaluation assets 0 650  
Goodwill 0 0  
Total assets (24,446) (14,384)  
Total liabilities (excluding long-term debt) (24,446) (14,384)  
Long-term debt $ 0 $ 0