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Dividends Declared - Summary of Dividends (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2022
R / shares
Dec. 31, 2022
$ / shares
Dec. 31, 2021
R / shares
Dec. 31, 2021
$ / shares
Dec. 31, 2020
R / shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
R / shares
Disclosure of Dividends [line items]              
Dividends declared per share | $ / shares   $ 0.34   $ 0.36   $ 0.16  
Final dividend              
Disclosure of Dividends [line items]              
Dividends declared per share     R 2.60   R 3.20   R 1
Interim dividend              
Disclosure of Dividends [line items]              
Dividends declared per share R 3   R 2.10   R 1.60    
Approved dividend              
Disclosure of Dividends [line items]              
Final dividend approved by the Board R 4.45