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Mining and Income Taxation - Summary of Domestic and Foreign Current Tax Rates (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Mining Tax [member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Effective mining tax rate for Gold Fields Operations Limited, GFI Joint Venture Holdings (Proprietary) Limited and owners of South Deep Mine | 29.00% | 29.00% | 29.00%

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- Definition Line item represents disclosure of domestic and foreign current tax rate. + References No definition available. + Details
Name: | gfi_DisclosureOfDomesticAndForeignCurrentTaxRateLineItems
Namespace Prefix: | gfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Effective mining income tax rate. + References No definition available. + Details
Name: | gfi_EffectiveMiningIncomeTaxRate
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | gfi_IncomeTaxAuthority1Axis=gfi_MiningTaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |