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Environmental Trust Funds - Schedule of Environmental Trust Funds (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Environmental Trust Funds [Abstract] |  |  |  |  |  |
Balance at beginning of the year | $ 44.5 | [1] | $ 35.0 |  |  |
Contributions from continuing operations | 8.6 |  | 7.5 |  |  |
Interest earned | 0.5 |  | 1.0 | [1] | $ 0.4 | [1]
Translation adjustment | 1.9 |  | 1.0 |  |  |
Balance at end of the year | $ 55.5 |  | $ 44.5 | [1] | $ 35.0 |
[1] | As Restated - Refer note 40 for further details.

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

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- 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