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Valuation Allowance for Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Valuation Allowance [Line Items] |  |
Valuation allowance for deferred tax assets | $ 386.8 us-gaap_DeferredTaxAssetsValuationAllowance | $ 330.2 us-gaap_DeferredTaxAssetsValuationAllowance
Orogen Investments SA (Luxembourg) |  |
Valuation Allowance [Line Items] |  |
Valuation allowance for deferred tax assets | 36.8 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_OrogenInvestmentSaLuxembourgMember | 41.0 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_OrogenInvestmentSaLuxembourgMember
Gold Fields Arctic Platinum Oy |  |
Valuation Allowance [Line Items] |  |
Valuation allowance for deferred tax assets | 18.3 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_GoldFieldsArcticPlatinumOyMember | 23.2 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_GoldFieldsArcticPlatinumOyMember
GFI Joint Venture Holdings |  |
Valuation Allowance [Line Items] |  |
Valuation allowance for deferred tax assets | 305.3 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_GfiJointVenturesHoldingPtyLimitedMember | 266.0 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_GfiJointVenturesHoldingPtyLimitedMember
Gold Fields Operations |  |
Valuation Allowance [Line Items] |  |
Valuation allowance for deferred tax assets | $ 26.4 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = gfi_GoldFieldsOperationsMember |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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