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Undiscounted Closure Cost Estimates (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Asset Retirement Obligations [Line Items] |  |  |  |
Total closure cost estimate | $ 390.8 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts | [1] | $ 355.2 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts | [1]
South Africa |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Total closure cost estimate | 32.3 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_ZA |  | 33.3 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_ZA |
Ghana |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Total closure cost estimate | 89.4 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_GH |  | 83.3 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_GH |
Australia |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Total closure cost estimate | 212.7 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_AU |  | 196.6 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_AU |
Peru |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Total closure cost estimate | $ 56.4 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_PE |  | $ 42.0 gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts / us-gaap_StatementGeographicalAxis = country_PE |
[1] | Includes discounting of $90.7 million in the year ended December 31, 2014 (December 31, 2013: $86.0 million) in order to reconcile the gross closure cost estimate of $390.8 million (December 31, 2013: $355.2 million) to the provision for environmental rehabilitation of $300.1 million (December 31, 2013: $269.2 million)

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