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Share Capital - Summary of Beneficial Shareholders (Detail)
12 Months Ended
Dec. 31, 2018
shares
Government Employees Pension Fund [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 53,726,997
Percentage of issued ordinary shares 6.48%
VanEck Vectors Gold Miners ETF [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 52,395,279
Percentage of issued ordinary shares 6.32%