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CURRENT AND DEFERRED INCOME TAX - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Movement in deferred tax not recognized $ (128,066) $ (60,540)
Net proceeds from sale of marketable securities 63,445 68,641
Deferred income tax liabilities 107,909 114,576
Temporary differences associated with investments in subsidiaries 58,724 $ 75,814
Decrease in tax loss carry forward $ 357,000  
Statutory tax rate 27.00% 26.00%
Investments in Subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred income tax liabilities $ 17,617 $ 22,744
Pretium Resources Inc    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Increase (decrease) in number of shares outstanding (9.0)  
Net proceeds from sale of marketable securities $ 63,400  
Income tax payable 7,800  
Argentine Operation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Movement in deferred tax not recognized 125,700  
Change to tax expense from restructuring activities 114,100  
Current tax expense $ 4,700