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Contingent Liabilities - Additional Information (Detail) R in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 ZAR (R) | May 30, 2018 USD ($) | May 30, 2018 ZAR (R) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 ZAR (R)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Provisions | $ |  | $ 319.5 |  |  |  | $ 321.3 |  |
GFI Joint Venture Holdings (Proprietary) Limited [Member] | South African Revenue Service [Member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Additional capital allowance recognised |  |  |  | $ 185.1 | R 2,708.0 |  |  |
Tax effect of additional capital allowance recognised |  |  |  | $ 53.7 | R 785.3 |  |  |
Silicosis [Member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Provisions |  | 25.1 | R 367.8 |  |  |  | $ 30.2 | R 400.2
Nominal amount of provision |  | $ 34.7 | 507.0 |  |  |  |  |
Alleged thefts [Member] | Randgold and Exploration Summons [Member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Amount of summons claims computed pursuant to allegedly received |  |  | 43,700.0 |  |  |  |  |
South Deep Mine [member] | Gold Fields Operations Limited [Member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture | 50.00% |  |  |  |  |  |  |
South Deep Mine [member] | GFI Joint Venture Holdings (Proprietary) Limited [Member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture | 50.00% |  |  |  |  |  |  |
Based On Value Of Shares [Member] | Alleged thefts [Member] | Randgold and Exploration Summons [Member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Amount of summons claims computed pursuant to allegedly received |  |  | R 26,900.0 |  |  |  |  |

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