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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	$ 12,400,000us-gaap_AssetImpairmentCharges		$ 103,700,000us-gaap_AssetImpairmentCharges	$ 32,000,000us-gaap_AssetImpairmentCharges
Number of vessels impaired		1fro_NumberOfVesselsImpaired		5fro_NumberOfVesselsImpaired
Related party, Lease termination payments paid				32,600,000fro_RelatedPartyLeaseTerminationPaymentsPaid
Period of rate reduction		4 years
Contingent rental expense (income)		4,237,000fro_ContingentRentalIncomeExpense	(8,726,000)fro_ContingentRentalIncomeExpense	0fro_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					9,100,000fro_ReductionInCapitalLeaseObligationAndCorrespondingReductionInVesselsUnderCapitalLeaseWhichResultedFromReassessmentOfLeasesDueToChangeInLeaseTerms / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember	9,100,000fro_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					6,500fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember	6,500fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
Total Compensation paid in exchange for rate reduction					106,000,000fro_TotalCompensationPaidInExchangeForRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember	106,000,000fro_TotalCompensationPaidInExchangeForRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
Amount of total compensation paid which is a non-refundable prepayment of profit share		50,000,000fro_AmountOfTotalCompensationPaidWhichIsNonRefundablePrepaymentOfProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember			50,000,000fro_AmountOfTotalCompensationPaidWhichIsNonRefundablePrepaymentOfProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember	50,000,000fro_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					56,000,000fro_AmountOfTotalCompensationPaidWhichIsReleaseOfRestrictedCashWhichServedAsSecurityForCharterPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember	56,000,000fro_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)		32,700,000fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember	0fro_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						126,500,000fro_Changeincapitalleaseobligationsduetoratereduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
Change in capital lease obligations due to payment						106,000,000fro_Changeincapitalleaseobligationsduetopayment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
Total profit share		0fro_TotalProfitShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
OBO [Member]
Leases, Schedule of Leased Assets [Line Items]
Asset Impairment Charges				27,300,000us-gaap_AssetImpairmentCharges / fro_PropertyPlantAndEquipmentByNameAxis = fro_OboMember
Double Hull Suezmax [Member]
Leases, Schedule of Leased Assets [Line Items]
Asset Impairment Charges				4,700,000us-gaap_AssetImpairmentCharges / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullSuezmaxMember
Number of vessels impaired							1fro_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		5us-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								2fro_Numberofvesselswhoseleasewasterminated / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullVlccMember
Number of vessels impaired			3fro_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		12us-gaap_CapitalLeasedAssetsNumberOfUnits / fro_PropertyPlantAndEquipmentByNameAxis = fro_DoubleHullVlccMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
Front Guider [Member]
Leases, Schedule of Leased Assets [Line Items]
Asset Impairment Charges				14,200,000us-gaap_AssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontGuiderMember
Related party, Lease termination payments paid									10,800,000fro_RelatedPartyLeaseTerminationPaymentsPaid / fro_VesselsByNameAxis = fro_FrontGuiderMember
Double Hull Suezmax [Member]
Leases, Schedule of Leased Assets [Line Items]
Number of vessels impaired				1fro_NumberOfVesselsImpaired / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_DoubleHullSuezmaxMember
OBO [Member]
Leases, Schedule of Leased Assets [Line Items]
Asset Impairment Charges				32,000,000us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_OboMember
Number of vessels impaired				4fro_NumberOfVesselsImpaired / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_OboMember
Number of vessels disposed of which have been impaired in the year				3fro_NumberOfVesselsDisposedOfWhichHaveBeenImpairedInYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fro_OboMember
VLCC Vessels [Member]
Leases, Schedule of Leased Assets [Line Items]
Asset Impairment Charges		$ 85,300,000us-gaap_AssetImpairmentCharges / fro_VesselsByTypeAxis = fro_VlccVesselsMember
Number of vessels whose lease was terminated				3fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_VlccVesselsMember						3fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_VlccVesselsMember
Number of vessels impaired			3fro_NumberOfVesselsImpaired / fro_VesselsByTypeAxis = fro_VlccVesselsMember

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- Definition

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+ References

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- Definition

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- Definition

Lease expiration maximum year based on vessel age

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- Definition

Percentage of charter revenues earned the Company agrees to pay as profit sharing expense in excess of daily base charterhire paid.

+ References

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- Definition

The amount of lease termination payments paid to related parties during the period.

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- Definition

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ 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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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- Definition

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