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Acquisition of Asanko Gold - Additional Information (Detail) - USD ($) $ in Millions	Mar. 29, 2018	Dec. 31, 2018
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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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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