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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	81,471us-gaap_Depreciation	99,823us-gaap_Depreciation	114,845us-gaap_Depreciation
Leased Vessels [Member]
Capital Leased Assets [Line Items]
Capital Leased Assets, Gross	1,424,653us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	1,627,703us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	1,940,227us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	2,073,779us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	874,308us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	922,895us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	1,047,138us-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	550,345us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	704,808us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	893,089us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	1,022,172us-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		155,848fro_DisposalOfAccumulatedDepreciationOfVesselsUnderCapitalLease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	100,806fro_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	118,976fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	(49,784)fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	0fro_Tangibleassetimpairmentchargesaccumulateddepreciationchargeportion / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember
Capital lease modification adjustment to carrying value of asset	1,210fro_CapitalLeaseModificationAdjustmentToCarryingValueOfAsset / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember		9,115fro_CapitalLeaseModificationAdjustmentToCarryingValueOfAsset / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember
Depreciation	0us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	0us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_LeasedVesselsMember	0us-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

X

- 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.

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- Definition

Depreciation expense on capital leases

+ References

No definition available.

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X

- Definition

Disposal of accumulated depreciation of vessels under capital lease

+ References

No definition available.

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- 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.

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- Definition

Tangible asset impairment charges, accumulated depreciation charge portion

+ References

No definition available.

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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

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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

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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



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-Name Accounting Standards Codification

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-Section 55

-Paragraph 40

-Subparagraph (Note 2)

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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)

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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

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