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Risk Management Activities - Summary of Effect of Change in Finance Expense on Group's Profit or Loss had LIBOR and Prime Differed as Indicated (Parenthetical) (Detail) - Closing foreign exchange rate [member] - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Average rate | 0.69 | 0.70
Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Average rate | 16.38 | 14.46

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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