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LOSS ON DE-CONSOLIDATION OF SUBSIDIARIES 1 (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jul. 15, 2014 vessel | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of vessels owned through ITCL | 4 fro_NumberOfVesselsOwnedThroughItcl |  |  |  |
Loss from de-consolidation of subsidiaries |  | $ 12,415 us-gaap_DeconsolidationGainOrLossAmount | $ 0 us-gaap_DeconsolidationGainOrLossAmount | $ 0 us-gaap_DeconsolidationGainOrLossAmount |
Debt Amortized Discount from Bond Buyback Sale |  | (1,629)fro_DebtAmortizedDiscountfromBondBuybackSale | (1,820)fro_DebtAmortizedDiscountfromBondBuybackSale |  |
Windsor Group [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Loss from de-consolidation of subsidiaries |  |  |  |  | 12,400 us-gaap_DeconsolidationGainOrLossAmount / dei_LegalEntityAxis = fro_WindsorGroupMember
First Preferred Mortgage Term Notes due 2021 [Member] | Windsor Group [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Debt Amortized Discount from Bond Buyback Sale |  |  |  |  | $ 8,800 fro_DebtAmortizedDiscountfromBondBuybackSale / dei_LegalEntityAxis = fro_WindsorGroupMember / us-gaap_LongtermDebtTypeAxis = fro_FirstPreferredMortgageTermNotesDue2021Member
8.04% First Preferred Mortgage Term Notes |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  | 7.84%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum / us-gaap_LongtermDebtTypeAxis = fro_FirstPreferredMortgageTermNotesDue2019And2021Member

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- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + 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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- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4582445-111684 + Details
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