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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | May 30, 2018
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
South African statutory mining tax rate | 34.00% | 34.00% | 34.00% |  |
South African Revenue Service [Member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Gross recognised capital allowance disallowed |  |  |  | $ 182.2 |
Legal settlement amount |  |  |  |  | $ 185.1
Capital allowance recognized |  |  |  | $ 925.5 | $ 53.7
Deferred tax assets not recognized [member] | Cerro Cerona and Damang [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred Tax assets at Cerro Cerona and Damang | $ 14.9 | $ 12.9 | $ 34.9 |  |
Deferred tax assets not recognized [member] | Cerro Cerona [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred Tax assets at Cerro Cerona and Damang | 14.9 | 12.9 | 33.5 |  |
Deferred tax assets not recognized [member] | Damang [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred Tax assets at Cerro Cerona and Damang | 0.0 | 0.0 | $ 1.4 |  |
Deferred tax assets recognized [member] | Cerro Cerona [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred Tax assets at Cerro Cerona and Damang | 0.0 | 17.3 |  |  |
Deferred tax assets recognized [member] | Damang [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred Tax assets at Cerro Cerona and Damang | $ 6.5 | $ 2.5 |  |  |

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