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Dividends - Summary of Dividends (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2021
R / shares
Dec. 31, 2021
$ / shares
Dec. 31, 2020
R / shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
R / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
R / shares
Disclosure of Dividends [line items]              
Dividends declared per share | $ / shares   $ 0.36   $ 0.16   $ 0.05  
Final dividend              
Disclosure of Dividends [line items]              
Dividends declared per share     R 3.20   R 1   R 0.20
Interim dividend              
Disclosure of Dividends [line items]              
Dividends declared per share R 2.10   R 1.60   R 0.60    
Approved dividend              
Disclosure of Dividends [line items]              
Final dividend approved by the Board R 2.60