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Undiscounted Closure Cost Estimates (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Asset Retirement Obligations [Line Items]      
Reconciliation of closure cost estimate, discount $ 90.7gfi_ReconciliationOfClosureCostEstimateDiscount $ 86.0gfi_ReconciliationOfClosureCostEstimateDiscount  
Total closure cost estimate 390.8gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts [1] 355.2gfi_ProvisionForAssetRetirementObligationsUndiscountedClosureCosts [1]  
Provision for environmental rehabilitation $ 300.1us-gaap_MineReclamationAndClosingLiabilityNoncurrent $ 269.2us-gaap_MineReclamationAndClosingLiabilityNoncurrent $ 373.6us-gaap_MineReclamationAndClosingLiabilityNoncurrent
[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)