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IMPAIRMENT OF LONG TERM ASSETS (Details) (USD $) | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 vessel | Dec. 31, 2014 vessel | Dec. 31, 2013 Rate | Dec. 31, 2012 vessel | Oct. 31, 2014 | Nov. 30, 2014 vessel | Sep. 30, 2014 | Mar. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment loss on vessels |  |  | $ 97,709,000 fro_ImpairedAssetstobeDisposedofbyMethodOtherthanSaleAmountofImpairmentLossContinuingOperations | $ 103,724,000 fro_ImpairedAssetstobeDisposedofbyMethodOtherthanSaleAmountofImpairmentLossContinuingOperations | $ 4,726,000 fro_ImpairedAssetstobeDisposedofbyMethodOtherthanSaleAmountofImpairmentLossContinuingOperations |  |  |  |
Number of vessels impaired |  |  | 1 fro_NumberOfVesselsImpaired |  | 5 fro_NumberOfVesselsImpaired |  |  |  |
Impairment of vessels |  |  |  | 103,700,000 us-gaap_TangibleAssetImpairmentCharges | 32,000,000 us-gaap_TangibleAssetImpairmentCharges |  |  |  |
Asset Impairment Charges | 12,400,000 us-gaap_AssetImpairmentCharges |  |  | 103,700,000 us-gaap_AssetImpairmentCharges | 32,000,000 us-gaap_AssetImpairmentCharges |  |  |  |
Lease Termination Probability | 100.00%fro_LeaseTerminationProbability |  |  | 100.00%fro_LeaseTerminationProbability |  |  |  |  |
Number of vessels assigned a probability of lease termination |  | 2 fro_Numberofvesselsassignedaprobabilityofleasetermination |  |  |  |  |  |  |
Front Opalia, Front Commerce & Front Commanche [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of Leased Vessels Impaired |  |  | 3 fro_NumberofLeasedVesselsImpaired / fro_VesselsByNameAxis = fro_FrontOpaliaFrontCommerceFrontCommancheMember |  |  |  |  |  |
VLCC Ulriken [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  | 26,000,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / fro_VesselsByNameAxis = fro_VLCCUlrikenMember |  |  |
Golden Victory [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  | 45,600,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_GoldenVictoryMember |  |  |  |  |
Front Champion [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  | 42,500,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontChampionMember |  |  |  |  |
Front Century [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  | 15,600,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontCenturyMember |  |  |  |  |
Front Rider [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  | 4,900,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontRiderMember |  |  |  |
Front Climber [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  | 4,200,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontClimberMember |  |  |  |
Front Driver [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  | 4,000,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontDriverMember |  |  |  |
Front Guider [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  | 14,200,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontGuiderMember |  |  |  |
Asset Impairment Charges |  |  |  |  | 14,200,000 us-gaap_AssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontGuiderMember |  |  |  |
Front Pride [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  | 4,700,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontPrideMember |  |  |  |
VLCC Vessels [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of Leased Vessels Impaired |  |  | 3 fro_NumberofLeasedVesselsImpaired / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |  |
Number of vessels impaired |  |  |  | 3 fro_NumberOfVesselsImpaired / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |
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 |  |
VLCC Vessels [Member] | Front Opalia, Front Commerce & Front Commanche [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of Leased Vessels Impaired |  |  | 3 fro_NumberofLeasedVesselsImpaired / fro_VesselsByNameAxis = fro_FrontOpaliaFrontCommerceFrontCommancheMember / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |  |
OBO [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels impaired |  |  |  |  | 4 fro_NumberOfVesselsImpaired / fro_VesselsByTypeAxis = fro_OboMember |  |  |  |
Impairment of vessels |  |  |  |  | 27,300,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByTypeAxis = fro_OboMember |  |  |  |
Number of vessels whose lease was terminated |  |  |  | 1 fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_OboMember | 3 fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_OboMember |  |  |  |
Double Hull Suezmax [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels impaired |  |  |  |  | 1 fro_NumberOfVesselsImpaired / fro_VesselsByTypeAxis = fro_DoubleHullSuezmaxMember |  |  |  |
Front Opalia [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  | 27,800,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontOpaliaMember |  |  |  |  |  |
Front Commerce [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  | 26,700,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontCommerceMember |  |  |  |  |  |
Front Comanche [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  | 30,700,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontComancheMember |  |  |  |  |  |
VLCC Ulriken [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  |  |  |  | 12,400,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_VLCCUlrikenMember |
VLCC Ulriken [Member] | VLCC Vessels [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels impaired |  |  | 1 fro_NumberOfVesselsImpaired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_VLCCUlrikenMember / fro_VesselsByTypeAxis = fro_VlccVesselsMember |  |  |  |  |  |
Ship Finance International Limited [Member] | Front Pride [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax |  |  |  |  |  |  |  |  | 200,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontPrideMember
Equipment [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  | 62,153,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |  |  |
Equipment [Member] | Front Champion / Golden Victory [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  | 88,100,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontChampionGoldenVictoryMember |  |  |  |  |
Equipment [Member] | VLCC Ulriken [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  |  |  |  | 12,400,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_VLCCUlrikenMember |
Equipment [Member] | Ship Finance International Limited [Member] | Front Champion / Golden Victory [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax |  |  |  | $ 13,800,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontChampionGoldenVictoryMember |  |  |  |  |

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