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Acquisition of Asanko Gold - Additional Information (Detail) - USD ($) $ in Millions | Mar. 29, 2018 | Dec. 31, 2018
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Disclosure of detailed information about business combination [line items] |  |
Key assumptions used to determine fair value of redeemable preference shares |  | $ 129.9
Asanko Gold Ghana Limited [member] |  |
Disclosure of detailed information about business combination [line items] |  |
Interest in subsidiary | 45.00% |
Government of Ghana ownership retained | 10.00% |
Adansi Gold Company Ghana Limited [member] |  |
Disclosure of detailed information about business combination [line items] |  |
Interest in subsidiary | 50.00% |
Shika Group Finance Limited [member] |  |
Disclosure of detailed information about business combination [line items] |  |
Interest in subsidiary | 50.00% |

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