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VESSELS UNDER CAPITAL LEASE, NET 3 (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
vessel
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Number of vessels in each variable interest entity 1fro_NumberOfVesselsInEachVariableInterestEntity        
Contingent rental expense (income) $ 4,237,000fro_ContingentRentalIncomeExpense $ (8,726,000)fro_ContingentRentalIncomeExpense $ 0fro_ContingentRentalIncomeExpense    
Deferred lease liability 0fro_DeferredLeaseLiability 0fro_DeferredLeaseLiability 3,795,000fro_DeferredLeaseLiability    
Gain on sale of assets and amortization of deferred gains 24,620,000fro_GainLossOnSaleOfAssets 23,558,000fro_GainLossOnSaleOfAssets 34,759,000fro_GainLossOnSaleOfAssets    
Special Purpose Entities [Member]          
Vessels leased from variable interest entities 4fro_VesselsLeasedFromVariableInterestEntities
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
4fro_VesselsLeasedFromVariableInterestEntities
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
     
Original cost to the lessor of the assets under variable interest entity arrangement 258,000,000fro_OriginalCostToLessorOfAssetsUnderVariableInterestEntityArrangement
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
258,000,000fro_OriginalCostToLessorOfAssetsUnderVariableInterestEntityArrangement
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
     
Guarantor obligations, maximum exposure, undiscounted 36,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
36,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
     
Profit share payment basis 25.00%fro_ProfitSharePaymentBasis
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
       
Profit share expense 0fro_ProfitShareExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
0fro_ProfitShareExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
0fro_ProfitShareExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
   
Repayments of Debt and Capital Lease Obligations 12,948,000us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
12,260,000us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
11,665,000us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
   
Contingent rental expense (income) 4,237,000fro_ContingentRentalIncomeExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
(7,761,000)fro_ContingentRentalIncomeExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
2,436,000fro_ContingentRentalIncomeExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
   
Capital Leases, Income Statement, Interest Expense 4,429,000us-gaap_CapitalLeasesIncomeStatementInterestExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
5,389,000us-gaap_CapitalLeasesIncomeStatementInterestExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
6,301,000us-gaap_CapitalLeasesIncomeStatementInterestExpense
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
   
Sale leaseback transaction, gross proceeds       67,000,000us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
/ dei_LegalEntityAxis
= fro_SpecialPurposeEntitiesMember
 
Operating Lease Length       2 years  
Maritime Equipment [Member] | VLCC Front Eagle renamed DHT Eagle [Member]          
Gain on sale of assets and amortization of deferred gains         3,200,000fro_GainLossOnSaleOfAssets
/ us-gaap_MajorPropertyClassAxis
= us-gaap_MaritimeEquipmentMember
/ fro_VesselsByNameAxis
= fro_VlccFrontEagleRenamedDhtEagleMember
Maritime Equipment [Member] | VLCC Front Eagle renamed DHT Eagle [Member] | Sale and Lease Back Transactions [Member]          
Gain on sale leaseback transaction recognized in period $ 0fro_GainOnSaleLeasebackTransactionRecognizedInPeriod
/ fro_LeaseTypeAxis
= fro_SaleAndLeaseBackTransactionsMember
/ us-gaap_MajorPropertyClassAxis
= us-gaap_MaritimeEquipmentMember
/ fro_VesselsByNameAxis
= fro_VlccFrontEagleRenamedDhtEagleMember
$ 2,300,000fro_GainOnSaleLeasebackTransactionRecognizedInPeriod
/ fro_LeaseTypeAxis
= fro_SaleAndLeaseBackTransactionsMember
/ us-gaap_MajorPropertyClassAxis
= us-gaap_MaritimeEquipmentMember
/ fro_VesselsByNameAxis
= fro_VlccFrontEagleRenamedDhtEagleMember
$ 7,200,000fro_GainOnSaleLeasebackTransactionRecognizedInPeriod
/ fro_LeaseTypeAxis
= fro_SaleAndLeaseBackTransactionsMember
/ us-gaap_MajorPropertyClassAxis
= us-gaap_MaritimeEquipmentMember
/ fro_VesselsByNameAxis
= fro_VlccFrontEagleRenamedDhtEagleMember