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VESSELS AND EQUIPMENT (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 15, 2014 vessel | Mar. 31, 2014 | Mar. 31, 2013 capital_lease | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2014 vessel | Mar. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2011
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Carrying Value Beginning balance |  | $ 264,804,000 fro_VesselsAndEquipmentNet |  | $ 264,804,000 fro_VesselsAndEquipmentNet |  |  |  |  |  |
Transfers to Vessels and Equipment |  |  |  | 56,740,000 fro_TransfersToVesselsAndEquipment |  |  |  |  |  |
Depreciation |  |  |  | (81,471,000)us-gaap_Depreciation | (99,823,000)us-gaap_Depreciation | (114,845,000)us-gaap_Depreciation |  |  |  |
Impairment of vessels |  |  |  |  | (103,700,000)us-gaap_TangibleAssetImpairmentCharges | (32,000,000)us-gaap_TangibleAssetImpairmentCharges |  |  |  |
Net Carrying Value ending balance |  |  |  | 56,624,000 fro_VesselsAndEquipmentNet | 264,804,000 fro_VesselsAndEquipmentNet |  |  |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  | 15,700,000 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges |  |  |  |  |  |  |  |
Number of vessels owned through ITCL | 4 fro_NumberOfVesselsOwnedThroughItcl |  |  |  |  |  |  |  |  |
Number Of Vessels Disposed Of |  |  | 1 fro_NumberOfVesselsDisposedOf |  |  |  |  |  |  |
Altair Voyager, Cygnus Voyager and Sirius Voyager [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Number of vessels whose lease was terminated |  |  |  |  |  |  | 3 fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByNameAxis = fro_AltairVoyagerCygnusVoyagerandSiriusVoyagerMember |  |  |
Front Alfa [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  |  |  |  |  |  |  | 2,100,000 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontAlfaMember |  |
Vessels and Equipment [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | 408,368,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 408,525,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 408,368,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 408,525,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 459,312,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  | 459,312,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |
Accumulated Depreciation beginning balance |  | (143,564,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (125,579,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (143,564,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (125,579,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (147,020,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  | (147,020,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |
Net Carrying Value Beginning balance |  | 264,804,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 282,946,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 264,804,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 282,946,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 312,292,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  | 312,292,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |
Purchase of vessels and equipment |  |  |  | 542,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 374,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 730,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Transfers to Vessels and Equipment |  |  |  | 56,740,000 fro_TransfersToVesselsAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |  |  |
Effect of de-consolidation of subsidiaries |  |  |  | (224,602,000)fro_PropertyPlantandEquipmentDeconsolidationofSubsidiaries / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |  |  |
Effect of de-consolidation of subsidiaries, accumulated depreciation |  |  |  | 49,803,000 fro_PropertyPlantandEquipmentDeconsolidationofSubsidiariesAccumulatedDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |  |  |
Other movements cost |  |  |  | (936,000)fro_OtherMovementsCost / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (531,000)fro_OtherMovementsCost / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 443,000 fro_OtherMovementsCost / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Other movements depreciation |  |  |  | (854,000)us-gaap_OtherDepreciationAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (449,000)us-gaap_OtherDepreciationAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (341,000)us-gaap_OtherDepreciationAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Depreciation |  |  |  | (11,082,000)us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (18,434,000)us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (18,508,000)us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Disposals cost |  |  |  | (117,297,000)us-gaap_PropertyPlantAndEquipmentDisposals / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  | (51,960,000)us-gaap_PropertyPlantAndEquipmentDisposals / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Disposals depreciation |  |  |  | 50,223,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  | 40,290,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Impairment of vessels |  |  |  | (62,153,000)us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |  |  |
Tangible asset impairment charges, accumulated depreciation charge portion |  |  |  | 49,728,000 fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |  |  |
Balance, end of period |  |  |  | 60,662,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 408,368,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 408,525,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Accumulated Depreciation ending balance |  |  |  | (4,038,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (143,564,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | (125,579,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Net Carrying Value ending balance |  |  |  | 56,624,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 264,804,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 282,946,000 fro_VesselsAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |  |  |
Vessel [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Number of vessels the company owns (in vessels) |  |  |  | 1 fro_NumberOfVesselsCompanyOwns / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember | 9 fro_NumberOfVesselsCompanyOwns / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember |  |  |  |  |
Number of Vessels classified as an investment in finance lease. |  |  |  |  | 3 fro_NumberOfVesselsClassifiedAsInvestmentInFinanceLease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember |  |  |  |  |
Vessel [Member] | VLCC Ulriken [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  |  |  |  |  | (12,400,000)us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember / fro_VesselsByNameAxis = fro_VLCCUlrikenMember |
Vessel [Member] | Altair Voyager, Cygnus Voyager and Sirius Voyager [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Number of vessels whose lease was terminated |  |  |  |  |  |  | 3 fro_Numberofvesselswhoseleasewasterminated / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember / fro_VesselsByNameAxis = fro_AltairVoyagerCygnusVoyagerandSiriusVoyagerMember |  |  |
Number Of Vessels Disposed Of |  |  |  |  |  |  | 3 fro_NumberOfVesselsDisposedOf / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember / fro_VesselsByNameAxis = fro_AltairVoyagerCygnusVoyagerandSiriusVoyagerMember |  |  |
Vessel [Member] | Front Alfa [Member] |  |  |  |  |  |  |  |  |  |
Vessels and equipment [Roll Forward] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  |  |  |  |  |  |  |  |  | $ 24,800,000 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_VesselsByNameMember / fro_VesselsByNameAxis = fro_FrontAlfaMember

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