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Share-Based Payments - Summary of Information Relating to the Options and Equity - Settled Instruments (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of fair value of equity instruments granted [line items] |  |  |
Weighted average share price during the year on the Johannesburg Stock Exchange (US$) | $ 9.25 | $ 4.82 | $ 3.46

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- Definition Disclosure of fair value of equity instruments granted. + References No definition available. + Details
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- Definition The weighted average share price. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_c&doctype=Standard -URIDate 2020-01-01 + Details
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