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Contingent Liabilities - Additional Information (Detail)
R in Millions, $ in Millions
Dec. 31, 2021
USD ($)
company
Dec. 31, 2021
ZAR (R)
company
Dec. 31, 2020
USD ($)
Dec. 31, 2020
ZAR (R)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
ZAR (R)
Disclosure of contingent liabilities [line items]            
Provisions | $ $ 13.1   $ 18.3   $ 21.2  
Silicosis            
Disclosure of contingent liabilities [line items]            
Number of gold mining companies | company 6 6        
Provisions $ 13.1 R 209.6 $ 18.3 R 268.6    
Nominal amount of provision $ 16.9 R 269.8        
Alleged thefts | Randgold and exploration summons            
Disclosure of contingent liabilities [line items]            
Amount of summons claims computed pursuant to allegedly received           R 43,700.0
Based on value of shares | Alleged thefts | Randgold and exploration summons            
Disclosure of contingent liabilities [line items]            
Amount of summons claims computed pursuant to allegedly received           R 26,900.0