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Environmental Trust Funds - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Environmental Trust Funds [abstract] |  |
Term deposit | $ 8.3 | $ 8.6
Equity-linked deposits | 6.5 | 7.5
Cash deposit | $ 46.0 | $ 39.6

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- Definition Environmental trust fund. + References No definition available. + Details
Name: | gfi_EnvironmentalTrustFundsAbstract
Namespace Prefix: | gfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Equity linked deposits environmental trust funds. + References No definition available. + Details
Name: | gfi_EquityLinkedDepositsEnvironmentalTrustFunds
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The portion of the funds intended to fund environmental rehabilitation obligations of the entity consisting of secured cash deposits. + References No definition available. + Details
Name: | gfi_SecuredCashDepositsEnvironmentalTrustFunds
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The portion of the funds intended to fund environmental rehabilitation obligations of the entity consisting of term deposits. + References No definition available. + Details
Name: | gfi_TermDepositsEnvironmentalTrustFunds
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration