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VESSELS UNDER CAPITAL LEASE, NET 4 (Details) (USD $) | 9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2014 vessel | Dec. 31, 2013 | Dec. 31, 2012 vessel | Dec. 31, 2011 | Dec. 31, 2011 | Mar. 31, 2013 vessel | Nov. 30, 2013 vessel | Dec. 27, 2012 | Nov. 30, 2014 vessel
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | $ 12,400,000 us-gaap_AssetImpairmentCharges |  | $ 103,700,000 us-gaap_AssetImpairmentCharges | $ 32,000,000 us-gaap_AssetImpairmentCharges |  |  |  |  |  |
Number of vessels impaired |  | 1 fro_NumberOfVesselsImpaired |  | 5 fro_NumberOfVesselsImpaired |  |  |  |  |  |
Related party, Lease termination payments paid |  |  |  | 32,600,000 fro_RelatedPartyLeaseTerminationPaymentsPaid |  |  |  |  |  |
Period of rate reduction |  | 4 years |  |  |  |  |  |  |  |
Contingent rental expense (income) |  | 4,237,000 fro_ContingentRentalIncomeExpense | (8,726,000)fro_ContingentRentalIncomeExpense | 0 fro_ContingentRentalIncomeExpense |  |  |  |  |  |
Ship Finance International Limited [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Lease expiration minimum year |  | 12/31/2018 |  |  |  |  |  |  |  |
Lease expiration maximum year |  | 12/31/2027 |  |  |  |  |  |  |  |
Reduction in capital lease obligation and corresponding reduction in vessels under capital lease which resulted from reassessment of leases due to change in lease terms |  |  |  |  | 9,100,000 fro_ReductionInCapitalLeaseObligationAndCorrespondingReductionInVesselsUnderCapitalLeaseWhichResultedFromReassessmentOfLeasesDueToChangeInLeaseTerms / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 9,100,000 fro_ReductionInCapitalLeaseObligationAndCorrespondingReductionInVesselsUnderCapitalLeaseWhichResultedFromReassessmentOfLeasesDueToChangeInLeaseTerms / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Percentage of charter revenues earned the Company agrees to pay as profit sharing expense in excess of daily base charterhire paid |  |  |  | 20.00%fro_PercentageOfCharterRevenuesEarnedCompanyAgreesToPayAsProfitSharingExpenseInExcessOfDailyBaseCharterhirePaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 20.00%fro_PercentageOfCharterRevenuesEarnedCompanyAgreesToPayAsProfitSharingExpenseInExcessOfDailyBaseCharterhirePaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |
Agreed per day rate reduction |  |  |  |  | 6,500 fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 6,500 fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Total Compensation paid in exchange for rate reduction |  |  |  |  | 106,000,000 fro_TotalCompensationPaidInExchangeForRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 106,000,000 fro_TotalCompensationPaidInExchangeForRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Amount of total compensation paid which is a non-refundable prepayment of profit share |  | 50,000,000 fro_AmountOfTotalCompensationPaidWhichIsNonRefundablePrepaymentOfProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  | 50,000,000 fro_AmountOfTotalCompensationPaidWhichIsNonRefundablePrepaymentOfProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 50,000,000 fro_AmountOfTotalCompensationPaidWhichIsNonRefundablePrepaymentOfProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Amount of total compensation paid which is a release of restricted cash which served as security for charter payments |  |  |  |  | 56,000,000 fro_AmountOfTotalCompensationPaidWhichIsReleaseOfRestrictedCashWhichServedAsSecurityForCharterPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 56,000,000 fro_AmountOfTotalCompensationPaidWhichIsReleaseOfRestrictedCashWhichServedAsSecurityForCharterPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Compensation percentage of any difference between the renegotiated rates and actual market rate up to the original contract rates |  |  |  | 100.00%fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 100.00%fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 100.00%fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Contingent rental expense (income) |  | 32,700,000 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 0 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |
Adjusted percentage of charter revenues earned the Company agrees to pay as profit sharing expense in excess of original threshold rate (in hundredths) |  |  | 25.00%fro_AdjustedPercentageOfCharterRevenuesEarnedCompanyAgreesToPayAsProfitSharingExpenseInExcessOfOriginalThresholdRate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |
Change in capital lease obligations due to rate reduction |  |  |  |  |  | 126,500,000 fro_Changeincapitalleaseobligationsduetoratereduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Change in capital lease obligations due to payment |  |  |  |  |  | 106,000,000 fro_Changeincapitalleaseobligationsduetopayment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Total profit share |  | 0 fro_TotalProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |
OBO [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 27,300,000 us-gaap_AssetImpairmentCharges / fro_PropertyPlantAndEquipmentByNameAxis = fro_OboMember |  |  |  |  |  |
Double Hull Suezmax [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 4,700,000 us-gaap_AssetImpairmentCharges / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullSuezmaxMember |  |  |  |  |  |
Number of vessels impaired |  |  |  |  |  |  | 1 fro_NumberOfVesselsImpaired / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullSuezmaxMember |  |  |
Double Hull Suezmax [Member] | Ship Finance International Limited [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Capital leased assets, number of units |  | 5 us-gaap_CapitalLeasedAssetsNumberOfUnits / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullSuezmaxMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |
Double Hull VLCC [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Number of vessels whose lease was terminated |  |  |  |  |  |  |  | 2 fro_Numberofvesselswhoseleasewasterminated / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullVlccMember |  |
Number of vessels impaired |  |  | 3 fro_NumberOfVesselsImpaired / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullVlccMember |  |  |  |  |  |  |
Double Hull VLCC [Member] | Ship Finance International Limited [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Capital leased assets, number of units |  | 12 us-gaap_CapitalLeasedAssetsNumberOfUnits / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullVlccMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |
Front Guider [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 14,200,000 us-gaap_AssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontGuiderMember |  |  |  |  |  |
Related party, Lease termination payments paid |  |  |  |  |  |  |  |  | 10,800,000 fro_RelatedPartyLeaseTerminationPaymentsPaid / fro_VesselsByNameAxis = fro_FrontGuiderMember |
Double Hull Suezmax [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Number of vessels impaired |  |  |  | 1 fro_NumberOfVesselsImpaired / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_DoubleHullSuezmaxMember |  |  |  |  |  |
OBO [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 32,000,000 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_OboMember |  |  |  |  |  |
Number of vessels impaired |  |  |  | 4 fro_NumberOfVesselsImpaired / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_OboMember |  |  |  |  |  |
Number of vessels disposed of which have been impaired in the year |  |  |  | 3 fro_NumberOfVesselsDisposedOfWhichHaveBeenImpairedInYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_OboMember |  |  |  |  |  |
VLCC Vessels [Member] |  |  |  |  |  |  |  |  |  |
Leases, Schedule of Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  | $ 85,300,000 us-gaap_AssetImpairmentCharges / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |  |  |  |
Number of vessels whose lease was terminated |  |  |  | 3 fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |  | 3 fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_VlccVesselsMember
Number of vessels impaired |  |  | 3 fro_NumberOfVesselsImpaired / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |  |  |

X
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