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FINANCIAL INSTRUMENTS 3 (Details) | 12 Months Ended |
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Dec. 31, 2014 | Mar. 26, 2010
8.04% First Preferred Mortgage Term Notes |  |
Debt Stated Interest Rate [Abstract] |  |
Stated interest rate, minimum | 7.84%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_LongtermDebtTypeAxis = fro_FirstPreferredMortgageTermNotesDue2019And2021Member |
Stated interest rate, maximum | 8.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = fro_FirstPreferredMortgageTermNotesDue2019And2021Member |
4.5% convertible bond due 2015 |  |
Debt Stated Interest Rate [Abstract] |  |
Stated interest rate (in hundredths) | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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