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Mineral Properties, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 18, 2018
Jan. 31, 2018
Jul. 11, 2016
May 08, 2016
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         $ 148,102 $ 200,837
Transfers to mineral reserves         38,100 78,300
Gain on sale of assets, after taxes     $ 600      
Reversals of impairment         61,554 0
Dolores mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         88,500 106,600
La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         20,300 52,900
Calcatreu project [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Reversals of impairment         1,317 0
Deferred Stripping Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         19,700 18,500
Pulp Agglomeration Construction Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         20,500 40,500
Underground Development Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         28,400 17,200
Underground Development Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         1,800 2,900
Powerline Construction Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions           6,800
Powerline Construction Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         3,400 6,100
Pad 3 Construction Additions [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions         $ 1,000 1,600
Shaft Construction Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions           19,300
Sulfide Plant Construction Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions           $ 12,800
Shalipayco S.A.C. [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Gains on disposals of investments       $ 18,300    
Proportion of ownership interest in associate sold       75.00%    
Proceeds from sales of investments in stock       $ 15,000    
Net smelter returns royalty receivable (percent)       1.00%    
Proceeds from sales of investment property       $ 3,300    
Gain on sale of assets, before tax     $ (6,600)      
Other disposals of assets [member] | Minera Aquiline Argentina SA [Member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Percent of shares of Minera Aquiline Argentina SA sold (percent)   100.00%        
Consideration for held-for-sale assets sold   $ 15,000        
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations $ 10,000 $ 5,000