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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
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Line of Credit Facility [Line Items] |  |
Unused lines of credit | $ 1,016.9 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity | $ 763.2 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Later than one year and not later than two years |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit | 64.9 us-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 |  | 96.7 us-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 | $ 952.0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gfi_MaturityThreeToFiveYearsMember | $ 666.5 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gfi_MaturityThreeToFiveYearsMember

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- 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
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