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Royalties - Summary of Royalties (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Times | Dec. 31, 2016 | Dec. 31, 2015
South Africa [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Royalty in refined minerals, description | The royalty in respect of refined minerals (which include gold refined to 99.5% and above and platinum) is calculated by dividing earnings before interest and taxes ("EBIT") by the product of 12.5 times gross revenue calculated as a percentage, plus an additional 0.5%. EBIT refers to taxable mining income (with certain exceptions such as no deduction for interest payable and foreign exchange losses) before assessed losses but after capital expenditure. |  |
Royalty effective rate | 0.50% | 0.50% | 0.50%
Australia [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Royalty effective rate | 2.50% | 2.50% | 2.50%
Ghana [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate |  | 5.00% | 5.00%
Royalty effective rate | 3.00% | 5.00% | 5.00%
Peru [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Royalty effective rate | 4.60% | 6.40% | 4.00%
Peru [member] | Top of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 12.00% |  |
Peru [member] | Bottom of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 1.00% |  |
Range One [Member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 3.00% |  |
Range One [Member] | Top of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 1,299.99 |  |
Range One [Member] | Bottom of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 0.00 |  |
Range Two [Member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 3.50% |  |
Range Two [Member] | Top of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 1,499.99 |  |
Range Two [Member] | Bottom of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 1,300.00 |  |
Range Three [Member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 4.10% |  |
Range Three [Member] | Top of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 2,299.99 |  |
Range Three [Member] | Bottom of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 1,450.00 |  |
Range Four [Member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 5.00% |  |
Range Four [Member] | Bottom of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Average gold price | $ 2,300.00 |  |
Gold refined minerals [member] | South Africa [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold refining percentage | 99.50% |  |
Refined minerals [member] | South Africa [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Number of times gross revenue | Times | 12.5 |  |
Additional percentage | 0.50% |  |
Refined minerals [member] | South Africa [member] | Top of range [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 5.00% |  |
Gold royalty [member] | Australia [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Gold royalty rate | 2.50% | 2.50% | 2.50%

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