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Financial Instruments - Additional Information (Details)
S/ / shares in Units, $ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
buyer
refinery
Dec. 31, 2020
MXN ($)
buyer
refinery
Dec. 31, 2020
PEN (S/)
buyer
refinery
Dec. 31, 2020
CAD ($)
buyer
refinery
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
CAD ($)
Dec. 31, 2020
MXN ($)
$ / shares
Dec. 31, 2020
PEN (S/)
S/ / shares
Sep. 30, 2020
USD ($)
Jul. 31, 2020
USD ($)
Disclosure of detailed information about financial instruments [line items]                        
Trade and other receivables $ 127,756,000       $ 168,753,000              
Value contained in precious metal inventory at refineries 430,546,000       370,716,000              
Gains (losses) on derivative contracts $ 3,543,000       $ 3,315,000              
Interest earned on cash and short-term investments (percent) 0.90% 0.90% 0.90% 0.90% 0.60% 0.60% 0.60% 0.60%        
Impact of 10% change in interest earned on earnings before taxes $ 100,000       $ 100,000              
Outstanding debt 0       275,000,000              
Minimum finance lease payments payable, at present value 33,565,000       41,208,000              
Impact of 10% increase in metal prices on revenues 138,000,000       139,100,000              
Impact of 10% decrease in metal prices on revenues 138,200,000       140,100,000              
Impact of 10% increase in metal prices on earnings before taxes 4,600,000       6,400,000              
Impact of 10% decrease in metal prices on earnings before taxes 4,600,000       6,400,000              
Dore [Member]                        
Disclosure of detailed information about financial instruments [line items]                        
Value contained in precious metal inventory at refineries 77,489,000       67,820,000              
Loans [Member]                        
Disclosure of detailed information about financial instruments [line items]                        
Amount borrowed                     $ 2,800,000 $ 2,800,000
Loans outstanding 0.0                      
Credit Facility [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Loans outstanding 0       275,000,000              
Production Concentration Risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Value contained in precious metal inventory at refineries $ 61,800,000       58,200,000              
Production Concentration Risk [member] | Dore [Member]                        
Disclosure of detailed information about financial instruments [line items]                        
Number of separate refineries worldwide | refinery 5 5 5 5                
Credit risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Current advances to suppliers $ 8,186,000       3,391,000              
Currency risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Outstanding positions in foreign currency exposure                 $ 51.0 S/ 45,600,000    
Put rate | (per share)                 $ 21.29 S/ 3.50    
Gains (losses) on derivative contracts   $ 1.6 S/ (2,200,000) $ (600,000)   $ 1.0 S/ 700,000 $ 300,000        
Effect of 10% change in exchange rate on income before taxes $ 9,200,000       $ 6,900,000              
Interest rate risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Weighted averate rate on lease liabilities 9.30%       9.70%       9.30% 9.30%    
Diesel Fuel Swaps Price Risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Gain on derivatives $ 4,700,000                      
Gain on derivatives 4,700,000                      
Trade receivables from provisional concentrate sales [member] | Customer Concentration Risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Trade and other receivables $ 35,100,000       $ 48,800,000              
Number of well-known concentrate buyers | buyer 5 5 5 5                
Trade receivables from dore sales [member] | Customer Concentration Risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Trade and other receivables $ 0       17,500,000              
Republic Metals [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Allowance account for credit losses of financial assets $ 4,700,000       $ 4,700,000              
Top of range [member] | Currency risk [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Call rate | (per share)                 $ 30.43 S/ 3.67    
Weighted average [member] | Loans [Member]                        
Disclosure of detailed information about financial instruments [line items]                        
Interest rate on borrowings (percent) 1.30%               1.30% 1.30%    
Weighted average [member] | Credit Facility [member]                        
Disclosure of detailed information about financial instruments [line items]                        
Interest rate on borrowings (percent) 2.60%       4.30%       2.60% 2.60%