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Share Capital - Summary of Beneficial Shareholders (Detail)
12 Months Ended
Dec. 31, 2017
shares
Government Employees Pension Fund [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 63,107,220
Percentage of issued ordinary shares 7.68%
Market Vectors Junior Gold Mines ETF [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 48,899,163
Percentage of issued ordinary shares 5.95%