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OTHER NON-CURRENT LIABILITIES - Narrative (Details)
ozt in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / ounce
ozt
Sep. 29, 2015
USD ($)
Pueblo Viejo    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Economic interest in subsidiary 60.00%  
Royal Gold    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Expected initial revenue payments (as percent) 30.00%  
Expected revenue payment from contracts with customers, as percent of prevailing spot prices on volume of mineral resources in deliveries thereafter (as percent) 60.00%  
Royal Gold | Pueblo Viejo    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Deposits from customers | $   $ 610
Silver | Royal Gold    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Threshold delivery volume (in ounces) 23,100  
Silver | Royal Gold | Pueblo Viejo    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Percent of interest in mineral resource production sold until initial delivery maximum achieved (as percent) 75.00%  
Initial delivery maximum (in ounces) 50,000  
Percent of interest in mineral resource production to be delivered thereafter (as percent) 37.50%  
Fixed recovery rate (as percent) 70.00%  
Silver | Pascua-Lama | Silver Wheaton Corp.    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Goods deliverable under contract (as percent) 25.00%  
Deposits from customers | $ $ 625  
Contract duration 3 years  
Selling price (in dollars per ounce) | $ / ounce 3.90  
Annual inflation adjustment (as percent) 1.00%  
Starting period after project period to apply annual inflation adjustment 3 years  
Gold | Royal Gold    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Threshold delivery volume (in ounces) 550  
Gold | Royal Gold | Pueblo Viejo    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Percent of interest in mineral resource production sold until initial delivery maximum achieved (as percent) 7.50%  
Initial delivery maximum (in ounces) 990  
Percent of interest in mineral resource production to be delivered thereafter (as percent) 3.75%  
Lagunas Norte, Pierina and Veladero | Silver | Silver Wheaton Corp.    
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items]    
Goods deliverable under contract (as percent) 100.00%