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Dividends - Summary of Dividends (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 $ / shares | Dec. 31, 2020 R / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2019 R / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2018 R / shares | Dec. 31, 2017 R / shares
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends declared per share | $ / shares | $ 0.16 |  | $ 0.05 |  | $ 0.06 |  |
Final Dividend [Member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends declared per share |  |  |  | R 1 |  | R 0.20 | R 0.50
Dividend declared date | Feb. 12, 2020 | Feb. 12, 2020 |  |  |  |  |
Interim Dividend [Member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends declared per share |  | R 1.60 |  | R 0.60 |  | R 0.20 |
Approved dividend [member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Final dividend approved by the Board, Value |  | R 3.20 |  |  |  |  |
Dividend approved date | Feb. 17, 2021 | Feb. 17, 2021 |  |  |  |  |

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