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v2.4.1.9

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 | 4 fro_NumberOfVesselsOwnedThroughItcl |  |  |  |  |  |  |  |  |  |  |  |
Transaction Details with Ship Finance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent rental expense (income) |  | $ 4,237,000 fro_ContingentRentalIncomeExpense | $ (8,726,000)fro_ContingentRentalIncomeExpense | $ 0 fro_ContingentRentalIncomeExpense |  |  |  |  |  |  |  |  |
Remaining lease obligation |  | 643,681,000 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 12,637,000 us-gaap_DueFromRelatedPartiesCurrent | 9,487,000 us-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 |  | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | 6,001,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | 13,298,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  | 103,700,000 us-gaap_TangibleAssetImpairmentCharges | 32,000,000 us-gaap_TangibleAssetImpairmentCharges |  |  |  |  |  |  |  |  |
Lease termination payments received |  |  |  | 22,200,000 fro_RelatedPartyLeaseTerminationPaymentsReceived |  |  |  |  |  |  |  |  |
Lease termination payments paid |  |  |  | 32,600,000 fro_RelatedPartyLeaseTerminationPaymentsPaid |  |  |  |  |  |  |  |  |
Front Pride [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  | 4,700,000 us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontPrideMember |  |  |  |  |  |  |  |  |
Front Champion / Golden Victory [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable |  |  | 79,000,000 fro_RelatedPartyNotePayable / fro_VesselsByNameAxis = fro_FrontChampionGoldenVictoryMember |  |  |  |  |  |  |  |  |  |
Front Opalia, Front Commerce and Front Comanche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable |  | 48,300,000 fro_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 |  | 2,320,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeatankersManagementCoLtdMember | 1,416,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeatankersManagementCoLtdMember | 1,009,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeatankersManagementCoLtdMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 320,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeatankersManagementCoLtdMember | 394,000 us-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 |  | 1,631,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GolarLngLimitedMember | 2,119,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GolarLngLimitedMember | 1,820,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GolarLngLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 0 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GolarLngLimitedMember | 942,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GolarLngLimitedMember |  |  |  |  |  |  |  |  |  |
Payables with related parties |  | 0 us-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) |  | 32,700,000 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 0 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances |  | 6,281,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 5,094,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 4,261,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 3,444,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 2,272,000 us-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 |  | 5,900,000 us-gaap_InterestExpenseRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable |  | 120,983,000 fro_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 |  | 109,952,000 fro_RelatedPartyNotePayableLongTermPortion / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable, Payable After Year 1 |  | 11,031,000 fro_RelatedPartyNotePayablePayableAfterYear1 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable, Payable After Year 2 |  | 14,070,000 fro_RelatedPartyNotePayablePayableAfterYear2 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable, Payable After Year 3 |  | 15,107,000 fro_RelatedPartyNotePayablePayableAfterYear3 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable, Payable After Year 4 |  | 16,197,000 fro_RelatedPartyNotePayablePayableAfterYear4 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable, Payable After Year 5 |  | 17,366,000 fro_RelatedPartyNotePayablePayableAfterYear5 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |  |  |  |  |  |  |  |
Related Party Note Payable, Payable Thereafter |  | 47,212,000 fro_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 |  |  |  |  |  | 7,800,000 fro_RelatedPartyLeaseTerminationPaymentsReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_EdinburghExTitanAriesMember |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax |  |  |  |  |  |  | 7,600,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_EdinburghExTitanAriesMember |  |  | 7,600,000 us-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 |  |  |  |  |  |  | 200,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontPrideMember |  |  | 200,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontPrideMember |  |  |
Lease termination payments paid |  |  |  |  |  |  | 2,100,000 fro_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 |  | 78,616,000 fro_RelatedPartyNotePayable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontChampionGoldenVictoryMember |  |  |  |  |  |  |  |  |  |  |
Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  | 88,100,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontChampionGoldenVictoryMember |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax |  |  | 13,800,000 us-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 |  | 48,385,000 fro_RelatedPartyNotePayable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontOpaliaFrontCommerceandFrontComancheMember |  |  |  |  |  |  |  |  |  |  |
Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessels |  |  |  |  |  |  |  | 85,300,000 us-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 |  | 5,393,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GoldenOceanGroupLimitedMember | 3,166,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GoldenOceanGroupLimitedMember | 5,566,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GoldenOceanGroupLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 1,490,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_GoldenOceanGroupLimitedMember | 1,219,000 us-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 |  | 646,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcadiaPetroleumLimitedMember | 7,962,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcadiaPetroleumLimitedMember | 5,423,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcadiaPetroleumLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 124,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcadiaPetroleumLimitedMember | 174,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcadiaPetroleumLimitedMember |  |  |  |  |  |  |  |  |  |
Related Party Note Payable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Earned freights on chartering vessels |  |  | 7,500,000 fro_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 |  | 2,348,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeadrillLimitedMember | 1,475,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeadrillLimitedMember | 2,574,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeadrillLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 557,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_SeadrillLimitedMember | 1,478,000 us-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 |  | 466,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcherLimitedMember | 410,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcherLimitedMember | 390,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcherLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 100,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ArcherLimitedMember | 8,000 us-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 |  | 149,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_DeepSeaSupplyPlcMember | 69,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_DeepSeaSupplyPlcMember | 41,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_DeepSeaSupplyPlcMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 61,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_DeepSeaSupplyPlcMember | 4,000 us-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 |  | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_AktivKapitalAsaMember | 40,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_AktivKapitalAsaMember | 21,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_AktivKapitalAsaMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 0 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_AktivKapitalAsaMember | 6,000 us-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 |  | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_OrionTankersLtdMember | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_OrionTankersLtdMember | 343,000 fro_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 |  | 10,102,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember | 7,410,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember | (4,004,000)fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  |  |  |  |  |  |
Number of vessels chartered in from Frontline 2012 |  |  |  | 2 fro_NumberOfVesselsCharteredInFromFrontline2012 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 3,672,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember | 2,860,000 us-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 |  |  |  |  |  | 6,000,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  |  |  |  |
Number of shares allocated in transaction in shares |  |  |  |  |  | 1,143,000 fro_NumberOfSharesAllocatedInTransactionInShares / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  |  |  |  | 3,546,000 fro_NumberOfSharesAllocatedInTransactionInShares / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember
Number of shares issued by Equity Method Investee in transaction |  |  |  |  |  | 59,000,000 fro_NumberOfSharesIssuedByEquityMethodInvesteeInTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  | 34,100,000 fro_NumberOfSharesIssuedByEquityMethodInvesteeInTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  | 56,000,000 fro_NumberOfSharesIssuedByEquityMethodInvesteeInTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember
Sale of Stock, Par Value |  |  |  |  |  |  |  |  | $ 2.00 fro_SaleofStockParValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  |
Sale of stock, price per share |  |  |  |  |  | $ 5.25 us-gaap_SaleOfStockPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  | $ 6.60 us-gaap_SaleOfStockPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |  |  | $ 3.75 us-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 |  |  |  |  |  |  |  |  | 4,700,000 fro_EquityMethodInvestmentGainLossOnDilutionOfOwnership / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember | 5,200,000 fro_EquityMethodInvestmentGainLossOnDilutionOfOwnership / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember | 700,000 fro_EquityMethodInvestmentGainLossOnDilutionOfOwnership / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |  |
Issuance ratio, number of shares held in equity method investee |  |  |  |  |  |  |  |  |  |  |  | 124.55 fro_Issuancerationumberofsharesheldinequitymethodinvestee / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |
Payment to participate in private placement of Frontline 2012 |  |  |  |  |  |  |  |  |  |  |  |  | 13,300,000 fro_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 |  | 1,128,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_NorthAtlanticDrillingLtdMember | 60,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_NorthAtlanticDrillingLtdMember | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_NorthAtlanticDrillingLtdMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 817,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_NorthAtlanticDrillingLtdMember | 75,000 us-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 |  | 80,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasILimitedMember | 54,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasILimitedMember | 51,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasILimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 0 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasILimitedMember | 14,000 us-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 |  | 80,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasIiLimitedMember | 54,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasIiLimitedMember | 51,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasIiLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 0 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersBahamasIiLimitedMember | 14,000 us-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 |  | 80,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersIomLimitedMember | 54,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersIomLimitedMember | 51,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersIomLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 0 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersIomLimitedMember | 14,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_CalpetroTankersIomLimitedMember |  |  |  |  |  |  |  |  |  |
Northern Offshore Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction Details with Ship Finance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 13,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_NorthernOffshoreLtdMember | 13,000 us-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 |  | 287,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_WindsorGroupMember | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_WindsorGroupMember | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_WindsorGroupMember |  |  |  |  |  |  |  |  |
Payables with related parties |  | (5,844,000)us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_WindsorGroupMember | 0 us-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 |  | 2,341,000 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_KnightsbridgeTankersLimitedMember | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_KnightsbridgeTankersLimitedMember | 0 fro_RelatedPartyTransactionsEarningsIncurredFromRelatedPartiesexcludingShipFinanceLeaseTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_KnightsbridgeTankersLimitedMember |  |  |  |  |  |  |  |  |
Due from Related Parties, Current |  | 2,039,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_KnightsbridgeTankersLimitedMember | 0 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_KnightsbridgeTankersLimitedMember |  |  |  |  |  |  |  |  |  |
Payables with related parties |  | (320,000)us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_KnightsbridgeTankersLimitedMember | 0 us-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) |  | 123,225,000 fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 150,891,000 fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 161,840,000 fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |  |  |  |  |  |  |
Lease termination fees (expense) income |  | 0 fro_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 | 22,766,000 fro_LeaseTerminationFeesExpenseIncome / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |  |  |  |  |  |  |
Contingent rental expense (income) |  | 32,663,000 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 0 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 20,020,000 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |  |  |  |  |  |  |
Remaining lease obligation |  | 593,998,000 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 726,717,000 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 875,670,000 us-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) |  | 0 fro_ContingentRentalIncomeExpense / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 0 fro_ContingentRentalIncomeExpense / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 32,156,000 fro_ContingentRentalIncomeExpense / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessels |  | 0 us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 0 us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 27,316,000 us-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) |  | 0 fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 434,000 fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 14,492,000 fro_RelatedPartyTransactionsCharterhirePaidIncludingPrincipalAndInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Lease termination fees (expense) income |  | 0 fro_LeaseTerminationFeesExpenseIncome / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 0 fro_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) |  | 0 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 0 fro_ContingentRentalIncomeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 32,156,000 fro_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 |  |  |  |  |  |  |  |  |  |  |  | 108,069 fro_NumberOfSharesAllocatedInTransactionInShares / dei_LegalEntityAxis = fro_AvanceGasMember |
Issuance ratio, number of shares issued per share holding in equity method investee |  |  |  |  |  |  |  |  |  |  |  | 1 fro_Issuancerationumberofsharesissuedpershareholdinginequitymethodinvestee / dei_LegalEntityAxis = fro_AvanceGasMember |
Value of shares allocated in transaction in Dollars |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 fro_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 |  |  |  |  |  |  |  |  |  |  |  | 89,900,000 fro_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 |  |  |  |  |  |  |  |  |  |  |  | 10,900,000 fro_RelatedPartyLeaseTerminationPaymentsPaid / fro_MethodofPaymentAxis = fro_UpfrontPaymentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / fro_VesselsByNameAxis = fro_FrontChampionGoldenVictoryMember |
Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessels |  | 62,153,000 us-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] |  |  |  |  |  |  |  |  |  |  |  |  |
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Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax |  | 40,400,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontOpaliaFrontCommerceandFrontComancheMember |  |  |  |  |  |  |  |  |  |  |
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Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease termination payments paid |  | 58,800,000 fro_RelatedPartyLeaseTerminationPaymentsPaid / fro_MethodofPaymentAxis = fro_UpfrontPaymentNotePayableMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = fro_FrontOpaliaFrontCommerceandFrontComancheMember |  |  |  |  |  |  |  |  |  |  |
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Related Party Equity Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
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