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SEGMENTED INFORMATION - Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Carrying amount of goodwill by segment    
Goodwill $ 696,809 $ 696,809
Gross carrying amount    
Carrying amount of goodwill by segment    
Goodwill 896,873 896,873
Accumulated impairment    
Carrying amount of goodwill by segment    
Goodwill (200,064) (200,064)
Canadian Malartic joint operation    
Carrying amount of goodwill by segment    
Goodwill 657,792 657,792
Canadian Malartic joint operation | Gross carrying amount    
Carrying amount of goodwill by segment    
Goodwill 657,792 657,792
Meliadine project | Gross carrying amount    
Carrying amount of goodwill by segment    
Goodwill 200,064 200,064
Meliadine project | Accumulated impairment    
Carrying amount of goodwill by segment    
Goodwill (200,064) (200,064)
La India mine    
Carrying amount of goodwill by segment    
Goodwill 39,017 39,017
La India mine | Gross carrying amount    
Carrying amount of goodwill by segment    
Goodwill $ 39,017 $ 39,017