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Dividends - Summary of Dividends (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 $ / shares | Dec. 31, 2018 R / shares | Dec. 31, 2017 $ / shares | Dec. 31, 2017 R / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2016 R / shares | Dec. 31, 2015 R / shares
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends declared per share | $ / shares | $ 0.06 |  | $ 0.08 |  | $ 0.05 |  |
Final Dividend [Member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends declared per share |  |  |  | R 0.50 |  | R 0.60 | R 0.21
Dividend declared date | Feb. 13, 2018 | Feb. 13, 2018 |  |  |  |  |
Interim Dividend [Member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends declared per share |  | R 0.20 |  | R 0.40 |  | R 0.50 |
Approved dividend [member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Final dividend approved by the Board, Value |  | R 0.20 |  |  |  |  |
Dividend approved date | Feb. 13, 2019 | Feb. 13, 2019 |  |  |  |  |

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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_107&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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