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Asset Impairments and Write Offs (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Impairment Of Assets [Line Items]

Asset impairment and write off

$ 14.0us-gaap_AssetImpairmentCharges

$ 215.3us-gaap_AssetImpairmentCharges

$ 41.6us-gaap_AssetImpairmentCharges

Life of mine years

72 years

73 years

Property, Plant and Equipment

Impairment Of Assets [Line Items]

Asset impairment and write off

12.7us-gaap_AssetImpairmentCharges
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember

122.3us-gaap_AssetImpairmentCharges
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember

14.5us-gaap_AssetImpairmentCharges
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember

Yanfolila

Impairment Of Assets [Line Items]

Percentage of sale interest project

85.00%gfi_PercentageOfOwnershipInterestSold
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_YanfolilaMember

Equity acquisition, amount

21.1us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_YanfolilaMember

Yanfolila | Property, Plant and Equipment

Impairment Of Assets [Line Items]

Asset impairment and write off

29.7us-gaap_AssetImpairmentCharges
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_YanfolilaMember

^[1]

Damang - asset group

Impairment Of Assets [Line Items]

Life of mine years

6 years

Damang - asset group | Property, Plant and Equipment

Impairment Of Assets [Line Items]

Asset impairment and write off

53.0us-gaap_AssetImpairmentCharges
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_DamangAssetGroupMember

^[2]

Real discount rate

8.00%us-gaap_FairValueInputsDiscountRate
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_DamangAssetGroupMember

Long-term gold price per ounce

1,300gfi_FairValueInputsPricePerOunce
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_DamangAssetGroupMember

Resource valuation per ounce

26gfi_FairValueInputsResourceValuationPerOunce
/ gfi_ImpairedOtherAssetsHeldAndUsedByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gfi_DamangAssetGroupMember

Non-refundable option payment to Bezant | Other

Impairment Of Assets [Line Items]

Asset impairment and write off

$ 9.5us-gaap_AssetImpairmentCharges
/ us-gaap_FinancialInstrumentAxis
= gfi_OtherImpairmentAssetsHeldAndUsedMember
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= gfi_NonRefundableOptionPaymentToBezantMember

Option expiration date

Jan. 31, 2014

[1]

Following the Group's decision during fiscal 2013 to dispose of non-core projects, Yanfolila was classified as held for sale and, accordingly, valued at the lower of fair value less cost to sell or carrying value which resulted in an impairment of US$29.7 million during fiscal 2013. During fiscal 2014, Gold Fields sold its 85% interest in the Yanfolila project for $21.1 million (refer note 3(c )).

[2]

As the undiscounted cash flows for Damang were less than its carrying value in fiscal 2013, the fair value of Damang was calculated using a combination of the market (comparable resource transactions) and the income (present value techniques) methods. The impairment was mainly due to the decrease in the gold price which impacted the life of mine plan. The key assumptions used in the calculation were as follows: - Real discount rate - 8% - Gold price per ounce - $1,300 - Resource valuation per ounce - $26 - 2013 life of mine years - 6 The fair value calculation was very sensitive to the gold price assumption and an increase or decrease in the gold price could materially change the fair value.

X

- Definition

Gold price per ounce used to find the present value of an amount to be paid or received in the future as an input to measure fair value.

+ References

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- Definition

Resource valuation per ounce used to find the present value of an amount to be paid or received in the future as an input to measure fair value.

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- Definition

Expiry date for exercising non-refundable option.

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X

- Definition

Percentage of ownership interest sold.

+ References

No definition available.

+ Details

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X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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