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Environmental Trust Funds - Schedule of Environmental Trust Funds (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Environmental Trust Funds [abstract]
Balance at beginning of the year	$ 55.5	$ 44.5
Contributions from continuing operations	7.7	8.6
Interest earned	0.6	0.5	$ 1.0
Translation adjustment	(3.0)	1.9
Balance at end of the year	$ 60.8	$ 55.5	$ 44.5

X

- Definition

The amount of contributions into funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

+ Details

Name:	gfi_ContributionsEnvironmentalTrustFunds
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The funds intended to fund environmental rehabilitation obligations of the entity and are not available for general purposes of the entity.

+ References

No definition available.

+ Details

Name:	gfi_EnvironmentalTrustFunds
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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 amount of interest earned on funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

+ Details

Name:	gfi_InterestEarnedEnvironmentalTrustFund
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of exchange differences arising on funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

+ Details

Name:	gfi_TranslationAdjustmentEnvironmentalTrustFund
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration