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Investment in Associates - Additional Information (Details)
 2 Months Ended 5 Months Ended 12 Months Ended
Jun. 05, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Oct. 29, 2020
Jun. 05, 2020
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of associates [line items]            
Proceeds from common shares issued         $ 619,000 $ 4,737,000
Income (loss) in associate         4,347,000 $ 10,529,000
Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Common shares issued in connection with exercise of stock options (shares) | shares 8,250,000          
Proceeds from exercise of warrants $ 15,600,000          
Proportion of ownership interest in associate   17.00% 18.00% 17.00%   26.00%
Deferred revenue   $ 13,300,000     12,500,000 $ 13,300,000
Gain on disposition of shares pursuant to Secondary Offering         (2,616,000) 23,467,000
Income (loss) in associate         $ 4,510,000 $ 1,369,000
Maverix Metals Inc. [member] | Exercise Price of $1.56 [Member]            
Disclosure of associates [line items]            
Common shares issued in connection with exercise of stock options (shares) | shares 5,000,000          
Exercise price (in USD per share) | $ / shares $ 1.56     $ 1.56    
Maverix Metals Inc. [member] | Exercise Price of $2.408 [Member]            
Disclosure of associates [line items]            
Common shares issued in connection with exercise of stock options (shares) | shares 3,250,000          
Exercise price (in USD per share) | $ / shares $ 2.408     2.408    
La Colorada mine [member] | Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Agreements to sell future gold production, percent of production (percent)         100.00%  
Agreements to sell future gold production, price per ounce (in USD per ounce)         650  
La Bolsa mine [member] | Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Agreements to sell future gold production, percent of production (percent)         5.00%  
Agreements to sell future gold production, price per ounce (in USD per ounce)         450  
Ordinary shares [member] | Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Number of shares acquired (sold) | shares 8,250,000          
Ordinary shares [member] | Maverix Metals Inc. [member] | Secondary Offering [Member]            
Disclosure of associates [line items]            
Number of shares acquired (sold) | shares (10,350,000)          
Sale of common shares, price per share | $ / shares $ 4.40     $ 4.40    
Proceeds from common shares issued $ 45,500,000          
Underwriting fees, percentage of gross proceeds 4.00%          
Underwriting fees paid $ 1,900,000