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Segment disclosure - Disclosure of detailed information about assets and expenses related to the exploration, evaluation and development of mining projects (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net assets (as at December 31)      
Mining interests, plant and equipment $ 333,778 $ 0  
Exploration and evaluation assets 42,949 95,002 $ 102,182
Net assets 376,727 95,002  
Expenses (for the years ended December 31)      
Exploration and evaluation 191 183  
Impairment of exploration and evaluation assets 49,985 0  
Expenses $ 50,176 $ 183