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Mining and Income Taxation - Summary of Domestic and Foreign Current Tax Rates (Detail)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mining tax      
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]      
Effective mining tax rate 29.00% 29.00% 29.00%
South African taxation | Non-mining tax      
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]      
Current tax rates 28.00% 28.00% 28.00%
South African taxation | Company tax rate      
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]      
Current tax rates 28.00% 28.00% 28.00%
Australia | Non-mining tax      
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]      
Current tax rates 30.00% 30.00% 30.00%
Ghana | Non-mining tax      
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]      
Current tax rates 32.50% 32.50% 32.50%
Peru | Non-mining tax      
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]      
Current tax rates 29.50% 29.50% 29.50%