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Investment in Associates - Additional Information (Details)
$ / shares in Units, shares in Millions
2 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Jun. 29, 2018
USD ($)
royalty
$ / shares
shares
Aug. 17, 2017
USD ($)
shares
Apr. 20, 2017
USD ($)
shares
Feb. 21, 2017
USD ($)
royalty
shares
Jul. 11, 2016
Apr. 20, 2017
USD ($)
Feb. 21, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / pure
Jun. 29, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / pure
Ounce
Dec. 31, 2017
USD ($)
Ounce
Dec. 31, 2016
USD ($)
Disclosure of associates [line items]                          
Investments in subsidiaries, joint ventures and associates               $ 70,566,000   $ 55,017,000 $ 70,566,000 $ 55,017,000  
Warrant liability, representing in-substance ownership               (14,664,000)   (14,295,000) (14,664,000) (14,295,000)  
Proceeds from issuing Maverix shares                     1,081,000 2,606,000  
Deferred revenue               (13,300,000)   (12,000,000) (13,300,000) (12,000,000)  
Income (loss) in associate                     13,679,000 2,052,000  
Maverix Metals Inc. [member]                          
Disclosure of associates [line items]                          
Investments in subsidiaries, joint ventures and associates               69,116,000   53,567,000 69,116,000 53,567,000 $ 48,284,000
Warrant liability, representing in-substance ownership               $ (14,700,000)   $ (14,300,000) $ (14,700,000) (14,300,000)  
Proportion of ownership interest in associate         54.00% 41.00% 43.00% 29.00% 40.00% 40.00% 40.00%    
Number of royalties acquired | royalty 50     2                  
Stock issued in acquisition of royalty | shares 60.0   3.8 8.5                  
Number of common share purchase warrants issued in acquisition of royalty | shares 10.0                        
Common share purchase warrants, period exercisable 5 years                        
Exercise price per common share | $ / shares $ 1.64                        
Cash paid in acquisition of royalties $ 17,000,000     $ 5,000,000                  
Deferred revenue $ (1,900,000) $ (100,000) $ (200,000) $ (400,000)   $ (200,000) $ (400,000)   $ (1,900,000)        
Revenue from gold deliveries from La Colorada                     $ 600,000 $ 300,000  
Gold delivered from La Colorada (ounces) | Ounce                     3,968 2,347  
Dilution gains                     $ 13,288,000 $ 2,273,000  
Income (loss) in associate                     391,000 (221,000)  
Other [member]                          
Disclosure of associates [line items]                          
Investments in subsidiaries, joint ventures and associates               $ 1,450,000   $ 1,450,000 $ 1,450,000 $ 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     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     450    
CEF Senior Secured Loan Facility [Member] | Maverix Metals Inc. [member]                          
Disclosure of associates [line items]                          
Senior secured loan facility from CEF to Maverix, maximum borrowing capacity   $ 20,000,000.0                      
Ordinary shares [member] | Maverix Metals Inc. [member]                          
Disclosure of associates [line items]                          
Number of shares of Maverix common stock issued (shares) | shares   2.3                      
Proceeds from issuing Maverix shares   $ 2,500,000                      
Ordinary shares [member] | CEF Limited [Member] | Maverix Metals Inc. [member]                          
Disclosure of associates [line items]                          
Number of shares of Maverix common stock issued (shares) | shares   5.9                      
Proceeds from issuing Maverix shares   $ 5,300,000