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Share Capital - Summary of Beneficial Shareholders (Detail) - shares
 12 Months Ended
Aug. 20, 2020
Dec. 31, 2020
Disclosure of beneficial ownership [line items]    
Percentage of authorised but unissued stated capital as percentage of issued stated capital 5.00%  
Government Employees Pension Fund [member]    
Disclosure of beneficial ownership [line items]    
Number of shares   82,103,978
Percentage of issued ordinary shares   9.29%
VanEck Vectors Gold Miners ETF [member]    
Disclosure of beneficial ownership [line items]    
Number of shares   52,019,222
Percentage of issued ordinary shares   5.89%