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Non-Current Investments (Parenthetical) (Detail) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2014 USD ($) Investment | Dec. 31, 2013 USD ($) Investment | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Far South East Project [Member] | Dec. 31, 2013 Far South East Project [Member] | Dec. 31, 2014 Rusoro Mining Limited USD ($) | Dec. 31, 2013 Rusoro Mining Limited USD ($) | Dec. 31, 2014 Bezant Resources Plc USD ($) | Dec. 31, 2013 Bezant Resources Plc USD ($) | Dec. 31, 2014 Hummingbird Resources Plc USD ($) | Dec. 31, 2014 Rand Refinery Limited oz | Dec. 31, 2014 Rand Refinery Limited Gold Fields Operations Limited USD ($) | Dec. 31, 2014 Subordinated Loans Rand Refinery Limited | Jul. 25, 2014 Subordinated Loans Rand Refinery Limited USD ($) | Jul. 25, 2014 Subordinated Loans Rand Refinery Limited ZAR | Dec. 31, 2014 Robust Resources Limited [Member] USD ($) | Dec. 31, 2014 Listed Investments Radius Gold Incorporated USD ($) | Dec. 31, 2013 Listed Investments Radius Gold Incorporated USD ($) | Dec. 31, 2014 Listed Investments Gran Columbia Gold Corporation USD ($) | Dec. 31, 2013 Listed Investments Gran Columbia Gold Corporation USD ($) | Dec. 31, 2014 Listed Investments Sibanye Gold USD ($) | Dec. 31, 2013 Listed Investments Sibanye Gold USD ($) | Dec. 31, 2014 Listed Investments Orsu Metals Corp. USD ($) | Dec. 31, 2013 Listed Investments Orsu Metals Corp. USD ($) | Dec. 31, 2014 Listed Investments Clancy Exploration Ltd. USD ($) | Dec. 31, 2013 Listed Investments Clancy Exploration Ltd. USD ($) | Dec. 31, 2014 Listed Investments Tocqueville Bullion Reserve Ltd [Member] USD ($) | Dec. 31, 2014 Maximum Gold Fields Operations Limited USD ($) | Dec. 31, 2014 Maximum Gold Fields Operations Limited ZAR
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed investments, Market value, $ per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.07 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_RadiusGoldIncorporatedMember | $ 0.09 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_RadiusGoldIncorporatedMember | $ 0.34 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_GranColumbiaGoldCorporationMember | $ 0.78 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_GranColumbiaGoldCorporationMember | $ 1.92 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_SibanyeGoldMember | $ 1.12 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_SibanyeGoldMember | $ 0.02 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_OrsuMetalsCorpMember | $ 0.05 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_OrsuMetalsCorpMember | $ 0.01 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_ClancyExplorationLtdMember | $ 0.01 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_ClancyExplorationLtdMember | $ 1,178.73 gfi_ListedInvestmentsMarketValuePerShare / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_TocquevilleBullionReserveLtdMember |  |
Investments of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,274,565 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentIssuerAxis = gfi_RobustResourcesLimitedMember | 3,625,124 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_RadiusGoldIncorporatedMember | 3,625,124 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_RadiusGoldIncorporatedMember | 63,410 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_GranColumbiaGoldCorporationMember | 63,410 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_GranColumbiaGoldCorporationMember | 856,330 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_SibanyeGoldMember | 856,330 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_SibanyeGoldMember | 26,134,919 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_OrsuMetalsCorpMember | 26,134,919 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_OrsuMetalsCorpMember | 17,764,783 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_ClancyExplorationLtdMember | 17,764,783 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_ClancyExplorationLtdMember | 1,339 us-gaap_InvestmentOwnedBalanceShares / invest_InvestmentAxis = gfi_ListedInvestmentsMember / invest_InvestmentIssuerAxis = gfi_TocquevilleBullionReserveLtdMember |  |
Fair value | $ 4.4 us-gaap_AvailableForSaleSecuritiesNoncurrent | [1] | $ 3.2 us-gaap_AvailableForSaleSecuritiesNoncurrent | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Cost | 3.9 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  | 3.4 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gain/(loss) | 0.5 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax |  | (0.2)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized gains | 0.7 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |  | 0.2 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized losses | (0.2)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |  | (0.4)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The gross unrealized loss comprises the following number of equity instruments none of which have been in a continuous unrealized loss position for more than 12 months | 3 gfi_AvailableForSaleSecuritiesNotInContinuousUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions |  | 3 gfi_AvailableForSaleSecuritiesNotInContinuousUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain reclassified from equity on disposal of listed investments | 1.8 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax |  | 7.4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.6 us-gaap_PaymentsToAcquireInvestments / invest_InvestmentIssuerAxis = gfi_RobustResourcesLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in extended loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.8 gfi_InvestmentInLoanFacility / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RandRefineryLimitedMember | 1,200.0 gfi_InvestmentInLoanFacility / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RandRefineryLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan facility conversion into equity, convertible period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between actual inventory and accounting recorded as ounces of gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,000 gfi_OuncesOfGoldDifferenceBetweenActualInventoryAndAccountingRecords / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RandRefineryLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.2 us-gaap_CommitmentsAndContingencies / dei_LegalEntityAxis = gfi_GoldFieldsOperationsLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 37.3 us-gaap_CommitmentsAndContingencies / dei_LegalEntityAxis = gfi_GoldFieldsOperationsLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Advanced to loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 us-gaap_PaymentsForAdvanceToAffiliate / dei_LegalEntityAxis = gfi_GoldFieldsOperationsLimitedMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RandRefineryLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments and loans written down |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 gfi_InvestmentsAndLoansWrittenDown / dei_LegalEntityAxis = gfi_GoldFieldsOperationsLimitedMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RandRefineryLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.1 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gfi_GoldFieldsOperationsLimitedMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RandRefineryLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership % |  |  |  |  |  | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_FarSouthEastMember | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_FarSouthEastMember | 26.40%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RusoroMiningLimitedMember | 26.40%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RusoroMiningLimitedMember | 21.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_BezantResourcePlcMember | [2] | 21.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_BezantResourcePlcMember | [2] | 25.10%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_HummingbirdResourcesPlcMember | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of business |  |  |  |  |  | Exploration |  | Gold mining |  | Exploration | [2] |  |  | Exploration | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of equity investment |  |  |  |  |  |  |  | 1.8 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RusoroMiningLimitedMember | 3.3 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_RusoroMiningLimitedMember | 1.3 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_BezantResourcePlcMember | [2] | 5.1 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_BezantResourcePlcMember | [2] | 10.9 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_HummingbirdResourcesPlcMember | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, carrying value | $ 6.8 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  | $ 10.3 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  | $ 10.5 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  |  |  |  | $ 7.4 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gfi_BezantResourcePlcMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Listed investments consist mainly of: December 31, 2014 December 31, 2013 Number of shares Market value, $ per share Number of shares Market value, $ per share Radius Gold Incorporated 3,625,124 0.07 3,625,124 0.09 Gran Columbia Gold Corporation 63,410 0.34 63,410 0.78 Sibanye Gold 856,330 1.92 856,330 1.12 Orsu Metals Corp. 26,134,919 0.02 26,134,919 0.05 Clancy Exploration Ltd. 17,764,783 0.01 17,764,783 0.01 Tocqueville Bullion Reserve Ltd. 1,339 1,178.73 - - Details of the listed investments are as follows: December 31, 2014 December 31, 2013 Fair value 4.4 3.2 Less: Cost 3.9 3.4 Net unrealized gain/(loss) 0.5 (0.2 ) The net gain/(loss) comprises: Gross unrealized gains 0.7 0.2 Gross unrealized losses (0.2 ) (0.4 ) 0.5 (0.2 ) The gross unrealized loss comprises the following number of equity instruments none of which have been in a continuous unrealized loss position for more than 12 months 3 3 Realized gain reclassified from equity on disposal of listed investments ($ million) 1.8 7.4 Investments acquired during fiscal 2014 comprised mainly of Tocqueville Bullion Reserve Limited and Robust Resources Limited (fiscal 2013: Clancy Exploration Limited). The investment in Robust Resources limited comprised of 10,274,565 shares, which were acquired for $2.6 million. Investments disposed during fiscal 2014 comprised mainly of Robust Resources Limited (fiscal 2013: Northam Platinum Limited and Timpetra Resources Limited). As a result of the disposal of investments, a realized gain on disposal of listed investments before tax of $1.8 million (fiscal 2013: $7.4 million) was reclassified out of accumulated other comprehensive income to net income and is included in profit on disposal of investments and subsidiaries in the consolidated statement of operations.
[2] | During fiscal 2014, the investment in Bezant Resources Plc was impaired by $7.4 million to its fair value, as determined by its quoted market price. This impairment is considered other than temporary as the carrying value has been below the fair value for an extended period of time.
[3] | Gold Fields acquired a 25.1% interest in Hummingbird Resources Plc (Refer note 3(c) for further details).

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + 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 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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