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Term Loan and Revolving Credit Facility (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Opening balance	$ 2,060.1us-gaap_DebtLongtermAndShorttermCombinedAmount
Loans advanced	463.9us-gaap_ProceedsFromIssuanceOfDebt	3,177.7us-gaap_ProceedsFromIssuanceOfDebt	936.3us-gaap_ProceedsFromIssuanceOfDebt
Loans repaid	(591.8)us-gaap_RepaymentsOfDebt	(2,971.3)us-gaap_RepaymentsOfDebt	(975.9)us-gaap_RepaymentsOfDebt
Closing balance	1,910.9us-gaap_DebtLongtermAndShorttermCombinedAmount	2,060.1us-gaap_DebtLongtermAndShorttermCombinedAmount
$1,510 million term loan and revolving credit facility
Debt Instrument [Line Items]
Opening balance	773.5us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember
Loans advanced	41.5us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember	893.0us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember
Loans repaid	(189.0)us-gaap_RepaymentsOfDebt / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember	(119.5)us-gaap_RepaymentsOfDebt / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember
Closing balance	$ 626.0us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember	$ 773.5us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_LineOfCreditFacilityAxis = gfi_TermLoanAndRevolvingCreditFacilityMember

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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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.

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