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Provisions - Schedule of Assumption in Provision Calculation (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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South Africa [member] |  |
Disclosure of Provisions [Line Items] |  |
Inflation rate | 5.50% | 5.50%
Discount rate | 9.80% | 9.70%
Ghana [member] |  |
Disclosure of Provisions [Line Items] |  |
Inflation rate | 2.20% | 2.20%
Australia [member] |  |
Disclosure of Provisions [Line Items] |  |
Inflation rate | 2.50% | 2.50%
Peru [member] |  |
Disclosure of Provisions [Line Items] |  |
Inflation rate | 2.20% | 2.20%
Discount rate | 3.80% | 3.70%
Bottom of range [member] | Ghana [member] |  |
Disclosure of Provisions [Line Items] |  |
Discount rate | 9.20% | 9.70%
Bottom of range [member] | Australia [member] |  |
Disclosure of Provisions [Line Items] |  |
Discount rate | 2.60% | 1.90%
Top of range [member] | Ghana [member] |  |
Disclosure of Provisions [Line Items] |  |
Discount rate | 9.30% | 9.80%
Top of range [member] | Australia [member] |  |
Disclosure of Provisions [Line Items] |  |
Discount rate | 2.90% | 3.00%

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- Definition The discount rate used in the calculation of the provision for costs related to decommissioning, restoration and rehabilitation. + References No definition available. + Details
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- Details
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- Details
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- Details
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