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Environmental Trust Funds - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Environmental Trust Funds [abstract]
Term deposit	$ 17.6	$ 16.8
Cash deposit	$ 61.7	$ 52.7

X

- 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

X

- 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

X

- 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