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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
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                                 $ 0.07gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_RadiusGoldIncorporatedMember		 $ 0.09gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_RadiusGoldIncorporatedMember		 $ 0.34gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_GranColumbiaGoldCorporationMember		 $ 0.78gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_GranColumbiaGoldCorporationMember		 $ 1.92gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_SibanyeGoldMember		 $ 1.12gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_SibanyeGoldMember		 $ 0.02gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_OrsuMetalsCorpMember		 $ 0.05gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_OrsuMetalsCorpMember		 $ 0.01gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_ClancyExplorationLtdMember		 $ 0.01gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_ClancyExplorationLtdMember		 $ 1,178.73gfi_ListedInvestmentsMarketValuePerShare
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_TocquevilleBullionReserveLtdMember		    
Investments of shares                               10,274,565us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentIssuerAxis
= gfi_RobustResourcesLimitedMember		 3,625,124us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_RadiusGoldIncorporatedMember		 3,625,124us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_RadiusGoldIncorporatedMember		 63,410us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_GranColumbiaGoldCorporationMember		 63,410us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_GranColumbiaGoldCorporationMember		 856,330us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_SibanyeGoldMember		 856,330us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_SibanyeGoldMember		 26,134,919us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_OrsuMetalsCorpMember		 26,134,919us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_OrsuMetalsCorpMember		 17,764,783us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_ClancyExplorationLtdMember		 17,764,783us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_ClancyExplorationLtdMember		 1,339us-gaap_InvestmentOwnedBalanceShares
/ invest_InvestmentAxis
= gfi_ListedInvestmentsMember
/ invest_InvestmentIssuerAxis
= gfi_TocquevilleBullionReserveLtdMember		    
Fair value $ 4.4us-gaap_AvailableForSaleSecuritiesNoncurrent [1] $ 3.2us-gaap_AvailableForSaleSecuritiesNoncurrent [1]                                                      
Less: Cost 3.9us-gaap_AvailableForSaleSecuritiesAmortizedCost 3.4us-gaap_AvailableForSaleSecuritiesAmortizedCost                                                      
Net unrealized gain/(loss) 0.5us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax (0.2)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax                                                      
Gross unrealized gains 0.7us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 0.2us-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 3gfi_AvailableForSaleSecuritiesNotInContinuousUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions 3gfi_AvailableForSaleSecuritiesNotInContinuousUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions                                                      
Realized gain reclassified from equity on disposal of listed investments 1.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 7.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax                                                      
Investment acquired                               2.6us-gaap_PaymentsToAcquireInvestments
/ invest_InvestmentIssuerAxis
= gfi_RobustResourcesLimitedMember		                          
Investment in extended loan facility                           103.8gfi_InvestmentInLoanFacility
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_RandRefineryLimitedMember		 1,200.0gfi_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                     87,000gfi_OuncesOfGoldDifferenceBetweenActualInventoryAndAccountingRecords
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_RandRefineryLimitedMember		                                    
Commitment amount                                                         3.2us-gaap_CommitmentsAndContingencies
/ dei_LegalEntityAxis
= gfi_GoldFieldsOperationsLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 37.3us-gaap_CommitmentsAndContingencies
/ dei_LegalEntityAxis
= gfi_GoldFieldsOperationsLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Advanced to loan facility                       3.0us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= gfi_GoldFieldsOperationsLimitedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_RandRefineryLimitedMember		                                  
Investments and loans written down                       0gfi_InvestmentsAndLoansWrittenDown
/ dei_LegalEntityAxis
= gfi_GoldFieldsOperationsLimitedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_RandRefineryLimitedMember		                                  
Impairment of investment                       4.1us-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           1.8us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_RusoroMiningLimitedMember		 3.3us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_RusoroMiningLimitedMember		 1.3us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_BezantResourcePlcMember		 [2] 5.1us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_BezantResourcePlcMember		 [2] 10.9us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gfi_HummingbirdResourcesPlcMember		 [3]                                      
Other than temporary impairment, carrying value $ 6.8us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities $ 10.3us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities $ 10.5us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities         $ 7.4us-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).