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VESSELS UNDER CAPITAL LEASE, NET 1 (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Capital Leased Assets [Line Items] |  |  |  |
Impairment of vessels |  | $ (103,700)us-gaap_TangibleAssetImpairmentCharges | $ (32,000)us-gaap_TangibleAssetImpairmentCharges |
Depreciation | 81,471 us-gaap_Depreciation | 99,823 us-gaap_Depreciation | 114,845 us-gaap_Depreciation |
Leased Vessels [Member] |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |
Capital Leased Assets, Gross | 1,424,653 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 1,627,703 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 1,940,227 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 2,073,779 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 874,308 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 922,895 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 1,047,138 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | (1,051,607)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember
Capital Leases, Balance Sheet, Assets by Major Class, Net | 550,345 us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 704,808 us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 893,089 us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 1,022,172 us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember
Disposal of vessel under capital lease cost |  | (159,016)fro_DisposalOfVesselUnderCapitalLeaseCost / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | (110,625)fro_DisposalOfVesselUnderCapitalLeaseCost / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |
Disposal of accumulated depreciation of vessels under capital lease |  | 155,848 fro_DisposalOfAccumulatedDepreciationOfVesselsUnderCapitalLease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 100,806 fro_DisposalOfAccumulatedDepreciationOfVesselsUnderCapitalLease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |
Impairment of vessels | (204,260)us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | (153,508)us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | (32,042)us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |
Impairment of vessels, accumulated depreciation charge portion | 118,976 fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | (49,784)fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 0 fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |
Capital lease modification adjustment to carrying value of asset | 1,210 fro_CapitalLeaseModificationAdjustmentToCarryingValueOfAsset / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |  | 9,115 fro_CapitalLeaseModificationAdjustmentToCarryingValueOfAsset / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |
Depreciation | 0 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 0 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | 0 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |
Depreciation expense on capital leases | $ (70,389)fro_DepreciationExpenseOnCapitalLeases / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | $ (81,389)fro_DepreciationExpenseOnCapitalLeases / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember | $ (96,337)fro_DepreciationExpenseOnCapitalLeases / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember |

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- Definition Adjustment to the carrying value of a capital lease as a result of the modification to payment terms of a capital lease. + References No definition available. + Details
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Namespace Prefix: | fro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Depreciation expense on capital leases + References No definition available. + Details
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- Definition Disposal of accumulated depreciation of vessels under capital lease + References No definition available. + Details
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X
- Definition Disposal of vessel under capital lease cost - the reduction in the gross cost of vessels under capital lease as a result of the termination of a vessel lease. + References No definition available. + Details
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- Definition Tangible asset impairment charges, accumulated depreciation charge portion + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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