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Acquisition of Asanko Gold - Additional Information (Detail) - USD ($) $ in Millions | Mar. 29, 2018 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about business combination [line items] |  |  |
Fair value of redeemable preference shares |  |  | $ 129.9
Redeemable Preference Shares [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Purchase of redeemable preference shares |  | $ 20.0 |
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% |  |
Asanko Gold Ghana Limited [member] | Gold Fields Ghana Limited [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Interest in subsidiary | 45.00% |  |
Adansi Gold Company Ghana Limited [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Interest in subsidiary | 50.00% |  |
Adansi Gold Company Ghana Limited [member] | Gold Fields 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% |  |
Shika Group Finance Limited [member] | Gold Fields Ghana Limited [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Interest in subsidiary | 50.00% |  |

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