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Acquisition of Asanko Gold - Summary of Key Assumptions Used to Determine Fair Value of the Net Identifiable Assets Acquired (Detail) - $ / oz | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about business combination [line items] |  |
Discount rate | 10.27% |
Life-of-mine - 2019 to 2030 | 12 years |
Within one year [member] | US Dollars [member] |  |
Disclosure of detailed information about business combination [line items] |  |
US$ gold price | 1,200 |
Later than one year [member] | US Dollars [member] |  |
Disclosure of detailed information about business combination [line items] |  |
US$ gold price | 1,300 | 1,300
Life-of-mine - 2019 to 2030 | 75 years | 78 years

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