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Mining and Income Taxation - Summary of Components of Mining and Income Tax (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
South African statutory mining tax rate | 34.00% | 34.00% | 34.00%
Deferred Tax Assets not Recognised Cerro Cerona and Damang [Member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
Deferred Tax assets not recognised at Cerro Cerona and Damang | $ 12.9 | $ 34.9 | $ 112.5
Deferred Tax Assets not Recognised Cerro Cerona [Member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
Deferred Tax assets not recognised at Cerro Cerona and Damang | 12.9 | 33.5 | 76.9
Deferred Tax Assets not Recognised Damang [Member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
Deferred Tax assets not recognised at Cerro Cerona and Damang | 0.0 | $ 1.4 | $ 35.6
Deferred tax assets recognised Cerro Cerona [member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
Deferred Tax assets not recognised at Cerro Cerona and Damang | 17.3 |  |
Deferred tax assets recognised Damang [member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
Deferred Tax assets not recognised at Cerro Cerona and Damang | $ 2.5 |  |

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- Definition South African statutory mining tax rate. + References No definition available. + Details
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- Definition The amount of deferred tax asset when: (a) the utilisation of the deferred tax asset is dependent on future taxable profits in excess of the profits arising from the reversal of existing taxable temporary differences; and (b) the entity has suffered a loss in either the current or preceding period in the tax jurisdiction to which the deferred tax asset relates. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 82 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_82&doctype=Standard -URIDate 2017-03-09 + Details
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