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SUPPLEMENTAL INFORMATION (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 15, 2014
Mar. 26, 2010
Oct. 02, 2014
Oct. 31, 2014
Non-cash investing and financing activities [Abstract]              
Adjustment in capital lease obligation with equal and opposite impact on related party balance $ 99,500,000fro_Adjustmentincapitalleaseobligationduetoleasetermination            
Debt Conversion, Cash Payment 10,000,000fro_DebtConversionCashPayment            
Proceeds from Equity Method Investment, Dividends or Distributions 2,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions        
Lease Modifications [Member]              
Non-cash investing and financing activities [Abstract]              
Adjustment in capital lease obligation with equal and opposite impact on related party balance 105,800,000fro_Adjustmentincapitalleaseobligationduetoleasetermination
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_LeaseModificationsMember
           
Adjustment in capital lease obligation which resulted from reassessment of leases due to change in lease terms     9,100,000fro_AdjustmentInCapitalLeaseObligationWhichResultedFromReassessmentOfLeasesDueToChangeInLeaseTerms
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_LeaseModificationsMember
       
Debt Conversion [Member]              
Non-cash investing and financing activities [Abstract]              
Debt Conversion, Original Debt, Amount 45,500,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
25,000,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
         
Debt Instrument, Interest Rate, Stated Percentage 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
      4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
   
Debt Conversion, Converted Instrument, Shares Issued 12,996,476us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
6,474,827us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
         
Debt Conversion, Cash Payment 19,600,000fro_DebtConversionCashPayment
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
2,250,000fro_DebtConversionCashPayment
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_DebtConversionMember
         
Avance gas transaction [Member]              
Non-cash investing and financing activities [Abstract]              
Value of shares allocated in transaction in Dollars   1,300,000fro_ValueofsharesallocatedintransactioninDollars
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_AvancegastransactionMember
         
Proceeds from Equity Method Investment, Dividends or Distributions   1,300,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_AvancegastransactionMember
         
Number of shares allocated in transaction in shares   108,069fro_NumberOfSharesAllocatedInTransactionInShares
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= fro_AvancegastransactionMember
         
Windsor Group [Member]              
Non-cash investing and financing activities [Abstract]              
Restricted cash removed from deconsolidation       17,900,000us-gaap_CashDivestedFromDeconsolidation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_WindsorGroupMember
     
Other current assets removed from deconsolidation       28,100,000fro_OtherCurrentAssetsDivestedfromDeconsolidation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_WindsorGroupMember
     
Vessels removed from deconsolidation       174,800,000fro_VesselsDivestedfromDeconsolidation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_WindsorGroupMember
     
Other current liabilities removed from deconsolidation       28,600,000fro_OtherCurrentLiabilitiesDivestedfromDeconsolidation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_WindsorGroupMember
     
Debt removed from deconsolidation       179,800,000fro_DebtDivestedfromDeconsolidation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_WindsorGroupMember
     
Variable Interest Entities CalPetro Bahamas B1, CalPetro Bahamas BII, CalPetro IOM [Member]              
Non-cash investing and financing activities [Abstract]              
Proceeds from divestiture of businesses and interests in affiliates           1,300,000us-gaap_Cash
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_VariableInterestEntitiesCalpetroBahamasB1CalpetroBahamasBiiCalpetroIomMember
 
Restricted cash           700,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_VariableInterestEntitiesCalpetroBahamasB1CalpetroBahamasBiiCalpetroIomMember
 
Variable Interest Entity, Primary Beneficiary | Variable Interest Entities CalPetro Bahamas B1, CalPetro Bahamas BII, CalPetro IOM [Member]              
Non-cash investing and financing activities [Abstract]              
Proceeds from divestiture of businesses and interests in affiliates             1,300,000us-gaap_Cash
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_VariableInterestEntitiesCalpetroBahamasB1CalpetroBahamasBiiCalpetroIomMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Restricted cash             700,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fro_VariableInterestEntitiesCalpetroBahamasB1CalpetroBahamasBiiCalpetroIomMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Front Opalia, Front Commerce and Front Comanche [Member]              
Non-cash investing and financing activities [Abstract]              
Related Party Note Payable 48,300,000fro_RelatedPartyNotePayable
/ fro_VesselsByNameAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
           
Front Champion & Golden Victory [Member]              
Non-cash investing and financing activities [Abstract]              
Related Party Note Payable   79,000,000fro_RelatedPartyNotePayable
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember
         
Ship Finance International Limited [Member]              
Non-cash investing and financing activities [Abstract]              
Related Party Note Payable 120,983,000fro_RelatedPartyNotePayable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
           
Debt Instrument, Interest Rate, Stated Percentage 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
           
Ship Finance International Limited [Member] | Front Opalia, Front Commerce and Front Comanche [Member]              
Non-cash investing and financing activities [Abstract]              
Related Party Note Payable 48,385,000fro_RelatedPartyNotePayable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontOpaliaFrontCommerceandFrontComancheMember
           
Ship Finance International Limited [Member] | Front Champion & Golden Victory [Member]              
Non-cash investing and financing activities [Abstract]              
Related Party Note Payable $ 78,616,000fro_RelatedPartyNotePayable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember
/ fro_VesselsByNameAxis
= fro_FrontChampionGoldenVictoryMember