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Syndicated Revolving Credit Facility (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Opening balance | $ 2,060.1 us-gaap_DebtLongtermAndShorttermCombinedAmount |  |  |  |
Loans repaid | (591.8)us-gaap_RepaymentsOfDebt |  | (2,971.3)us-gaap_RepaymentsOfDebt |  | (975.9)us-gaap_RepaymentsOfDebt
Closing balance | 1,910.9 us-gaap_DebtLongtermAndShorttermCombinedAmount |  | 2,060.1 us-gaap_DebtLongtermAndShorttermCombinedAmount |  |
$500 million syndicated revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Opening balance |  |  | 104.0 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = gfi_SyndicatedRevolvingLoanFacilityMember |  |
Loans repaid |  |  | (104.0)us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = gfi_SyndicatedRevolvingLoanFacilityMember |  |
Closing balance | $ 0 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = gfi_SyndicatedRevolvingLoanFacilityMember | [1] | $ 0 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = gfi_SyndicatedRevolvingLoanFacilityMember | [1] |
[1] | $500 million syndicated revolving credit facility On February 15, 2013, this facility was refinanced by drawing down under the $1,510 million term loan and revolving credit facility as detailed in 16(g). The facility was also cancelled on February 15, 2013. December 31, 2014 December 31, 2013 Opening balance - 104.0 Loans repaid - (104.0 ) Closing balance - -

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |