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Schedule of Unused Lines of Committed Credit Facilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Unused lines of credit	$ 1,016.9us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity	$ 763.2us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Later than one year and not later than two years
Line of Credit Facility [Line Items]
Unused lines of credit	64.9us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gfi_MaturityOneToTwoYearsMember
Later than two years and not later than three years
Line of Credit Facility [Line Items]
Unused lines of credit		96.7us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gfi_MaturityTwoToThreeYearsMember
Later than three years and not later than five years
Line of Credit Facility [Line Items]
Unused lines of credit	$ 952.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gfi_MaturityThreeToFiveYearsMember	$ 666.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gfi_MaturityThreeToFiveYearsMember

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

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- Details

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