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Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Cost | $ 7,453.4 us-gaap_PropertyPlantAndEquipmentGross | $ 7,731.7 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization | (3,000.1)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (2,798.7)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net | 4,453.3 us-gaap_PropertyPlantAndEquipmentNet | 4,933.0 us-gaap_PropertyPlantAndEquipmentNet
Cumulative capitalized interest, net of amortization | 110.9 gfi_CapitalizedInterestCostNetOfAmortization | 103.9 gfi_CapitalizedInterestCostNetOfAmortization
Tarkwa Mine |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest, net of amortization | 9.0 gfi_CapitalizedInterestCostNetOfAmortization / us-gaap_StatementBusinessSegmentsAxis = gfi_TarkwaMineMember | 10.9 gfi_CapitalizedInterestCostNetOfAmortization / us-gaap_StatementBusinessSegmentsAxis = gfi_TarkwaMineMember
Cerro Corona |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest, net of amortization | 34.5 gfi_CapitalizedInterestCostNetOfAmortization / us-gaap_StatementBusinessSegmentsAxis = gfi_CerroCoronaMember | 43.0 gfi_CapitalizedInterestCostNetOfAmortization / us-gaap_StatementBusinessSegmentsAxis = gfi_CerroCoronaMember
South Africa |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest, net of amortization | 67.4 gfi_CapitalizedInterestCostNetOfAmortization / us-gaap_StatementGeographicalAxis = country_ZA | 50.0 gfi_CapitalizedInterestCostNetOfAmortization / us-gaap_StatementGeographicalAxis = country_ZA
Mining Properties, Mine Development Costs, Mine Plant Facilities and Mineral Interest |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, net | 3,807.2 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_MiningPropertiesMineDevelopmentCostsMinePlantFacilitiesAndMineralInterestMember | 4,285.1 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_MiningPropertiesMineDevelopmentCostsMinePlantFacilitiesAndMineralInterestMember
Asset Retirement Costs |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, net | 105.7 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_AssetRetirementCostsMember | 89.3 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_AssetRetirementCostsMember
Other Non-Mining Assets |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, net | $ 540.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_OtherNonMiningAssetsMember | $ 558.6 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_OtherNonMiningAssetsMember

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- Definition Cumulative interest incurred in respect of assets requiring a substantial period of time to prepare for their intended future use and are capitalized to the date that the assets are substantially completed. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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