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Provisions - Silicosis Settlement Costs - Additional Information (Detail) R in Millions, $ in Millions | Dec. 31, 2018 USD ($) | Dec. 31, 2018 ZAR (R) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 ZAR (R)
--- | --- | --- | --- | ---
Disclosure of Provisions [line items] |  |  |  |
Provisions | $ 25.1 |  | $ 31.9 |
Silicosis [Member] |  |  |  |
Disclosure of Provisions [line items] |  |  |  |
Provisions | 25.1 | R 367.8 | $ 31.9 | R 401.6
Nominal amount of provision | $ 34.7 | R 507.0 |  |
Silicosis [Member] | Government bonds [member] |  |  |  |
Disclosure of Provisions [line items] |  |  |  |
Discount rate on government bonds | 8.74% | 8.74% | 8.24% | 8.24%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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