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RELATED PARTY TRANSACTIONS (Details) (USD $)
0 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Jul. 15, 2014
vessel
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 31, 2013
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Oct. 31, 2013
May 29, 2012
Related Party Transaction [Line Items]                          
Number of vessels owned through ITCL 4fro_NumberOfVesselsOwnedThroughItcl                        
Transaction Details with Ship Finance [Abstract]                          
Contingent rental expense (income)   $ 4,237,000fro_ContingentRentalIncomeExpense $ (8,726,000)fro_ContingentRentalIncomeExpense $ 0fro_ContingentRentalIncomeExpense                  
Remaining lease obligation   643,681,000us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments                      
Due from Related Parties, Current   12,637,000us-gaap_DueFromRelatedPartiesCurrent 9,487,000us-gaap_DueFromRelatedPartiesCurrent                    
Payables with related parties   (55,713,000)us-gaap_DueToRelatedPartiesCurrent (11,419,000)us-gaap_DueToRelatedPartiesCurrent                    
Related Party Equity Transactions [Abstract]                          
Payments to Acquire Interest in Subsidiaries and Affiliates   0us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates 6,001,000us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates 13,298,000us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates                  
Impairment of vessels     103,700,000us-gaap_TangibleAssetImpairmentCharges 32,000,000us-gaap_TangibleAssetImpairmentCharges                  
Lease termination payments received       22,200,000fro_RelatedPartyLeaseTerminationPaymentsReceived                  
Lease termination payments paid       32,600,000fro_RelatedPartyLeaseTerminationPaymentsPaid                  
Front Pride [Member]                          
Related Party Equity Transactions [Abstract]                          
Impairment of vessels       4,700,000us-gaap_TangibleAssetImpairmentCharges
/ fro_VesselsByNameAxis
= fro_FrontPrideMember
                 
Front Champion / Golden Victory [Member]                          
Related Party Note Payable [Abstract]                          
Related Party Note Payable     79,000,000fro_RelatedPartyNotePayable
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
                   
Front Opalia, Front Commerce and Front Comanche [Member]                          
Related Party Note Payable [Abstract]                          
Related Party Note Payable   48,300,000fro_RelatedPartyNotePayable
/ fro_VesselsByNameAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
                     
Seatankers Management Co. Ltd [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   2,320,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
1,416,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
1,009,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
                 
Due from Related Parties, Current   320,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
394,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
                   
Payables with related parties   (343,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
(506,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeatankersManagementCoLtdMember
                   
Golar LNG Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   1,631,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
2,119,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
1,820,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
                 
Due from Related Parties, Current   0us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
942,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
                   
Payables with related parties   0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
(155,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GolarLngLimitedMember
                   
Ship Finance International Limited [Member]                          
Related Party Transaction [Line Items]                          
Percentage of charter revenues earned the Company agrees to pay as profit sharing expense in excess of daily base charterhire paid (in hundredths)       20.00%fro_PercentageOfCharterRevenuesEarnedCompanyAgreesToPayAsProfitSharingExpenseInExcessOfDailyBaseCharterhirePaid
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
20.00%fro_PercentageOfCharterRevenuesEarnedCompanyAgreesToPayAsProfitSharingExpenseInExcessOfDailyBaseCharterhirePaid
/ 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
                   
Transaction Details with Ship Finance [Abstract]                          
Contingent rental expense (income)   32,700,000fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
0fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                   
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   6,281,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
5,094,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
4,261,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                 
Due from Related Parties, Current   3,444,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
2,272,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                   
Payables with related parties   (45,244,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
(8,528,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                   
Related Party Note Payable [Abstract]                          
Debt Instrument, Interest Rate, Stated Percentage   7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Interest Expense, Related Party   5,900,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable   120,983,000fro_RelatedPartyNotePayable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable Amount Paid   (6,018,000)fro_RelatedPartyNotePayableAmountPaid
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Current Portion   (11,031,000)fro_RelatedPartyNotePayableCurrentPortion
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Long Term Portion   109,952,000fro_RelatedPartyNotePayableLongTermPortion
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Payable After Year 1   11,031,000fro_RelatedPartyNotePayablePayableAfterYear1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Payable After Year 2   14,070,000fro_RelatedPartyNotePayablePayableAfterYear2
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Payable After Year 3   15,107,000fro_RelatedPartyNotePayablePayableAfterYear3
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Payable After Year 4   16,197,000fro_RelatedPartyNotePayablePayableAfterYear4
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Payable After Year 5   17,366,000fro_RelatedPartyNotePayablePayableAfterYear5
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Related Party Note Payable, Payable Thereafter   47,212,000fro_RelatedPartyNotePayablePayableThereafter
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
                     
Ship Finance International Limited [Member] | Edinburgh (Ex Titan Aries) [Member]                          
Related Party Equity Transactions [Abstract]                          
Lease termination payments received           7,800,000fro_RelatedPartyLeaseTerminationPaymentsReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_EdinburghExTitanAriesMember
             
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax             7,600,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_EdinburghExTitanAriesMember
    7,600,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_EdinburghExTitanAriesMember
     
Ship Finance International Limited [Member] | Front Pride [Member]                          
Related Party Equity Transactions [Abstract]                          
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax             200,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontPrideMember
    200,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontPrideMember
     
Lease termination payments paid             2,100,000fro_RelatedPartyLeaseTerminationPaymentsPaid
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontPrideMember
           
Ship Finance International Limited [Member] | Front Champion / Golden Victory [Member]                          
Related Party Note Payable [Abstract]                          
Related Party Note Payable   78,616,000fro_RelatedPartyNotePayable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
                     
Related Party Equity Transactions [Abstract]                          
Impairment of vessels     88,100,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
                   
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax     13,800,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
                   
Ship Finance International Limited [Member] | Front Opalia, Front Commerce and Front Comanche [Member]                          
Related Party Note Payable [Abstract]                          
Related Party Note Payable   48,385,000fro_RelatedPartyNotePayable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
                     
Related Party Equity Transactions [Abstract]                          
Impairment of vessels               85,300,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
         
Golden Ocean Group Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   5,393,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
3,166,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
5,566,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
                 
Due from Related Parties, Current   1,490,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
1,219,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
                   
Payables with related parties   (914,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
(1,047,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_GoldenOceanGroupLimitedMember
                   
Bryggegata AS [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   (2,013,000)fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_BryggegataAsMember
(1,982,000)fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_BryggegataAsMember
(1,455,000)fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_BryggegataAsMember
                 
Arcadia Petroleum Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   646,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcadiaPetroleumLimitedMember
7,962,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcadiaPetroleumLimitedMember
5,423,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcadiaPetroleumLimitedMember
                 
Due from Related Parties, Current   124,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcadiaPetroleumLimitedMember
174,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcadiaPetroleumLimitedMember
                   
Related Party Note Payable [Abstract]                          
Earned freights on chartering vessels     7,500,000fro_RelatedPartyTransactionsEarnedFreightsCharteringVessels
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcadiaPetroleumLimitedMember
                   
Seadrill Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   2,348,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeadrillLimitedMember
1,475,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeadrillLimitedMember
2,574,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeadrillLimitedMember
                 
Due from Related Parties, Current   557,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeadrillLimitedMember
1,478,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_SeadrillLimitedMember
                   
Archer Limited (formerly Seawell) [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   466,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcherLimitedMember
410,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcherLimitedMember
390,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcherLimitedMember
                 
Due from Related Parties, Current   100,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcherLimitedMember
8,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ArcherLimitedMember
                   
Deep Sea Supply Plc [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   149,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_DeepSeaSupplyPlcMember
69,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_DeepSeaSupplyPlcMember
41,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_DeepSeaSupplyPlcMember
                 
Due from Related Parties, Current   61,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_DeepSeaSupplyPlcMember
4,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_DeepSeaSupplyPlcMember
                   
Aktiv Kapital ASA [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_AktivKapitalAsaMember
40,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_AktivKapitalAsaMember
21,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_AktivKapitalAsaMember
                 
Due from Related Parties, Current   0us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_AktivKapitalAsaMember
6,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_AktivKapitalAsaMember
                   
Orion Tankers Ltd [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_OrionTankersLtdMember
0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_OrionTankersLtdMember
343,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_OrionTankersLtdMember
                 
Frontline 2012 Ltd [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   10,102,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
7,410,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
(4,004,000)fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
                 
Number of vessels chartered in from Frontline 2012       2fro_NumberOfVesselsCharteredInFromFrontline2012
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
                 
Due from Related Parties, Current   3,672,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
2,860,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
                   
Payables with related parties   (3,048,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
(1,183,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
                   
Related Party Equity Transactions [Abstract]                          
Payments to Acquire Interest in Subsidiaries and Affiliates           6,000,000us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
             
Number of shares allocated in transaction in shares           1,143,000fro_NumberOfSharesAllocatedInTransactionInShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
            3,546,000fro_NumberOfSharesAllocatedInTransactionInShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Number of shares issued by Equity Method Investee in transaction           59,000,000fro_NumberOfSharesIssuedByEquityMethodInvesteeInTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
    34,100,000fro_NumberOfSharesIssuedByEquityMethodInvesteeInTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
      56,000,000fro_NumberOfSharesIssuedByEquityMethodInvesteeInTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Sale of Stock, Par Value                 $ 2.00fro_SaleofStockParValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
       
Sale of stock, price per share           $ 5.25us-gaap_SaleOfStockPricePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
    $ 6.60us-gaap_SaleOfStockPricePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
      $ 3.75us-gaap_SaleOfStockPricePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Percentage of share capital obtained in Frontline 2012 (in hundredths)     7.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
8.80%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
  6.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
    5.40%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
      7.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Equity method investment, gain loss on dilution of ownership                 4,700,000fro_EquityMethodInvestmentGainLossOnDilutionOfOwnership
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
5,200,000fro_EquityMethodInvestmentGainLossOnDilutionOfOwnership
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
700,000fro_EquityMethodInvestmentGainLossOnDilutionOfOwnership
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
   
Issuance ratio, number of shares held in equity method investee                       124.55fro_Issuancerationumberofsharesheldinequitymethodinvestee
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
 
Payment to participate in private placement of Frontline 2012                         13,300,000fro_PaymentToParticipateInPrivatePlacementOfFrontline2012
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
North Atlantic Drilling Ltd [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   1,128,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthAtlanticDrillingLtdMember
60,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthAtlanticDrillingLtdMember
0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthAtlanticDrillingLtdMember
                 
Due from Related Parties, Current   817,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthAtlanticDrillingLtdMember
75,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthAtlanticDrillingLtdMember
                   
CalPetro Tankers (Bahamas I) Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   80,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasILimitedMember
54,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasILimitedMember
51,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasILimitedMember
                 
Due from Related Parties, Current   0us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasILimitedMember
14,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasILimitedMember
                   
CalPetro Tankers (Bahamas II) Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   80,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasIiLimitedMember
54,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasIiLimitedMember
51,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasIiLimitedMember
                 
Due from Related Parties, Current   0us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasIiLimitedMember
14,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersBahamasIiLimitedMember
                   
CalPetro Tankers (IOM) Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   80,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersIomLimitedMember
54,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersIomLimitedMember
51,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersIomLimitedMember
                 
Due from Related Parties, Current   0us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersIomLimitedMember
14,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_CalpetroTankersIomLimitedMember
                   
Northern Offshore Ltd [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Due from Related Parties, Current   13,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthernOffshoreLtdMember
13,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_NorthernOffshoreLtdMember
                   
Windsor Group [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   287,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_WindsorGroupMember
0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_WindsorGroupMember
0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_WindsorGroupMember
                 
Payables with related parties   (5,844,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_WindsorGroupMember
0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_WindsorGroupMember
                   
Knightsbridge Tankers Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances   2,341,000fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
0fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
                 
Due from Related Parties, Current   2,039,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
0us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
                   
Payables with related parties   (320,000)us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_KnightsbridgeTankersLimitedMember
                   
Continuing Operations [Member] | Ship Finance International Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Charterhire paid (principal and interest)   123,225,000fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
150,891,000fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
161,840,000fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
                 
Lease termination fees (expense) income   0fro_LeaseTerminationFeesExpenseIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
(5,204,000)fro_LeaseTerminationFeesExpenseIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
22,766,000fro_LeaseTerminationFeesExpenseIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
                 
Contingent rental expense (income)   32,663,000fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
0fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
20,020,000fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
                 
Remaining lease obligation   593,998,000us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
726,717,000us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
875,670,000us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
                 
Discontinued Operations [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Contingent rental expense (income)   0fro_ContingentRentalIncomeExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0fro_ContingentRentalIncomeExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
32,156,000fro_ContingentRentalIncomeExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
                 
Related Party Equity Transactions [Abstract]                          
Impairment of vessels   0us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
27,316,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
                 
Discontinued Operations [Member] | Ship Finance International Limited [Member]                          
Transaction Details with Ship Finance [Abstract]                          
Charterhire paid (principal and interest)   0fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
434,000fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
14,492,000fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
                 
Lease termination fees (expense) income   0fro_LeaseTerminationFeesExpenseIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0fro_LeaseTerminationFeesExpenseIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
(24,543,000)fro_LeaseTerminationFeesExpenseIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
                 
Contingent rental expense (income)   0fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
32,156,000fro_ContingentRentalIncomeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
                 
Avance Gas [Member]                          
Related Party Equity Transactions [Abstract]                          
Number of shares allocated in transaction in shares                       108,069fro_NumberOfSharesAllocatedInTransactionInShares
/ dei_LegalEntityAxis
= fro_AvanceGasMember
 
Issuance ratio, number of shares issued per share holding in equity method investee                       1fro_Issuancerationumberofsharesissuedpershareholdinginequitymethodinvestee
/ dei_LegalEntityAxis
= fro_AvanceGasMember
 
Value of shares allocated in transaction in Dollars                       1,300,000fro_ValueofsharesallocatedintransactioninDollars
/ dei_LegalEntityAxis
= fro_AvanceGasMember
 
Upfront Payment / Note Payable [Member] | Ship Finance International Limited [Member] | Front Champion / Golden Victory [Member]                          
Related Party Equity Transactions [Abstract]                          
Lease termination payments paid                       89,900,000fro_RelatedPartyLeaseTerminationPaymentsPaid
/ fro_MethodofPaymentAxis
= fro_UpfrontPaymentNotePayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
 
Upfront Payment [Member] | Ship Finance International Limited [Member] | Front Champion / Golden Victory [Member]                          
Related Party Equity Transactions [Abstract]                          
Lease termination payments paid                       10,900,000fro_RelatedPartyLeaseTerminationPaymentsPaid
/ fro_MethodofPaymentAxis
= fro_UpfrontPaymentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
 
Equipment [Member]                          
Related Party Equity Transactions [Abstract]                          
Impairment of vessels   62,153,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
                     
Equipment [Member] | Front Opalia, Front Commerce and Front Comanche [Member] | Ship Finance International Limited [Member]                          
Related Party Equity Transactions [Abstract]                          
Impairment of vessels   85,300,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
                     
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax   40,400,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
                     
Equipment [Member] | Front Opalia, Front Commerce and Front Comanche [Member] | Upfront Payment / Note Payable [Member] | Ship Finance International Limited [Member]                          
Related Party Equity Transactions [Abstract]                          
Lease termination payments paid   58,800,000fro_RelatedPartyLeaseTerminationPaymentsPaid
/ fro_MethodofPaymentAxis
= fro_UpfrontPaymentNotePayableMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
                     
Equipment [Member] | Front Opalia, Front Commerce and Front Comanche [Member] | Upfront Payment [Member] | Ship Finance International Limited [Member]                          
Related Party Equity Transactions [Abstract]                          
Lease termination payments paid   $ 10,500,000fro_RelatedPartyLeaseTerminationPaymentsPaid
/ fro_MethodofPaymentAxis
= fro_UpfrontPaymentMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember