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Non Cash-Items (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 01, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Other Significant Noncash Transactions [Line Items]
Marked to market gain/(loss) of listed investments		$ 6.9us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	[1]	$ (1.3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	[1]	$ 18.7us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	[1]
Shares issued on acquisition (refer note 3(b))	127.3us-gaap_StockIssuedDuringPeriodValueAcquisitions
Yanfolila and Hummingbird
Other Significant Noncash Transactions [Line Items]
Disposal value for acquisition		5.1gfi_NoncashOrPartNoncashDivestitureAcquisitionConsiderationReceivedAndGivenNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_YanfolilaAndHummingbirdMember
Yanfolila
Other Significant Noncash Transactions [Line Items]
Disposal group (refer note 3(c))		(16.0)us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1 / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gfi_YanfolilaMember
Yilgarn South
Other Significant Noncash Transactions [Line Items]
Shares issued on acquisition (refer note 3(b))				127.3us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = gfi_YilgarnSouthMember
Sibanye Gold Limited [Member]
Other Significant Noncash Transactions [Line Items]
Spin-off (refer note 9.1), excluding cash transferred				927.3gfi_DisposalGroupIncludingDiscontinuedOperationNetAssetValueDistributedExcludingCashTransferred / dei_LegalEntityAxis = gfi_SibanyeGoldLimitedMember
Hummingbird
Other Significant Noncash Transactions [Line Items]
Acquisition of investment (refer note 3(c))		$ 21.1us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 / dei_LegalEntityAxis = gfi_HummingbirdMember
[1] Includes deferred tax of $nil (2013: $1.7 million and 2012: $1.0 million).

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