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Investment in Associates - Additional Information (Details)
12 Months Ended
Jul. 11, 2016
Dec. 31, 2019
USD ($)
$ / pure
Ounce
Dec. 31, 2018
USD ($)
Ounce
Dec. 31, 2017
USD ($)
Disclosure of associates [line items]        
Investments in subsidiaries, joint ventures and associates   $ 84,319,000 $ 70,566,000  
Warrant liability, representing in-substance ownership   (15,040,000) (14,664,000)  
Proceeds from issuing Maverix shares   2,781,000 1,081,000  
Income (loss) in associate   15,245,000 13,679,000  
Maverix Metals Inc. [member]        
Disclosure of associates [line items]        
Investments in subsidiaries, joint ventures and associates   84,319,000 69,116,000 $ 53,567,000
Warrant liability, representing in-substance ownership   $ (15,000,000) $ (14,700,000)  
Proportion of ownership interest in associate 54.00% 26.00% 34.00%  
Deferred revenue   $ (12,500,000) $ (13,300,000)  
Revenue from gold deliveries from La Colorada   $ 700,000 $ 600,000  
Gold delivered from La Colorada (ounces) | Ounce   3,758 3,968  
Dilution gains   $ 13,500,000 $ 13,300,000  
Income (loss) in associate   1,765,000 391,000  
Other [member]        
Disclosure of associates [line items]        
Investments in subsidiaries, joint ventures and associates   $ 0 $ 1,450,000  
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