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Schedule 1 - Valuation and Qualifying Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation allowance, Balance at beginning of year $ 330.2us-gaap_ValuationAllowancesAndReservesBalance $ 324.4us-gaap_ValuationAllowancesAndReservesBalance $ 152.4us-gaap_ValuationAllowancesAndReservesBalance
Valuation allowance reversed     (58.2)gfi_ValuationAllowanceReversed [1]
Valuation allowance raised 38.3gfi_ValuationAllowanceRaised [2] 1.1gfi_ValuationAllowanceRaised [2]  
Arising on acquisition/ disposal of subsidiaries   (5.4)gfi_ValuationAllowancesArisingOnAcquisitionOrDisposalOfSubsidiaries  
Charged to unredeemed capital expenditure 59.4us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts 60.2us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts 222.8us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
Foreign currency translation adjustment (41.1)us-gaap_ValuationAllowancesAndReservesAdjustments (50.1)us-gaap_ValuationAllowancesAndReservesAdjustments 7.4us-gaap_ValuationAllowancesAndReservesAdjustments
Valuation allowance, Balance at end of year $ 386.8us-gaap_ValuationAllowancesAndReservesBalance $ 330.2us-gaap_ValuationAllowancesAndReservesBalance $ 324.4us-gaap_ValuationAllowancesAndReservesBalance
[1] During fiscal year ended December 31, 2012, the Group reversed a portion of the valuation allowance against unredeemed capital expenditure and net operating losses to the extent that there is sufficient future taxable income. In making this determination, the Group analyzed, amongst other things, the recent history of earnings and cashflows, forecasts of future earnings, the nature and timing of future deductions and benefits represented by deferred tax assets and the cumulative earnings for the last three years.
[2] During fiscal year ended December 31, 2014, the Group raised a valuation allowance against unredeemed capital expenditure and net operating losses. In making this determination, the Group analyzed, amongst other things, the recent history of earnings and cashflows, forecasts of future earnings, the nature and timing of future deductions and benefits represented by deferred tax assets and the cumulative earnings for the last three years.