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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] | 12 Months Ended
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Dec. 31, 2017 R / $ $ / $ | Dec. 31, 2016 R / $ $ / $
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Foreign exchange rate | 12.58 | 14.03
Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Average rate | 13.33 | 14.70
Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Average rate | $ / $ | 0.77 | 0.75

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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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + 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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- Details
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