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GENERAL 1 (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 35 Months Ended 1 Months Ended 12 Months Ended
Jul. 15, 2014
vessel
Mar. 31, 2013
capital_lease
Dec. 31, 2014
tanker_size
T
Jan. 31, 2004
entity
vessel
Mar. 31, 2007
Feb. 28, 2008
Dec. 31, 2012
Dec. 31, 2011
vessel
Related Party Transaction [Line Items]                
Number of vessels disposed of   1fro_NumberOfVesselsDisposedOf            
Number of tanker sizes     2fro_NumberOfTankerSizes          
Lower range of VLCC tanker size (in dry weight tonnage)     200,000fro_VlccTankerSizeRangeMinimum          
Upper range of VLCC tanker size ((in dry weight tonnage)     320,000fro_VlccTankerSizeRangeMaximum          
Lower range of Suezmax tanker size (in dry weight tonnage)     120,000fro_SuezmaxTankerSizeRangeMinimum          
Upper range of Suezmax tanker size (in dry weight tonnage)     170,000fro_SuezmaxTankerSizeRangeMaximum          
Number of vessels the gross charter payment commitment was reduced (in number of vessels)               32fro_NumberOfVesselsGrossCharterPaymentCommitmentWasReduced
Number of vessels owned through ITCL 4fro_NumberOfVesselsOwnedThroughItcl              
Ship Finance International Limited [Member]                
Related Party Transaction [Line Items]                
Number of vessel-owning entities sold to Ship Finance (in entities)       46fro_NumberOfVesselOwningEntitiesTransferred
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember		        
Number of vessels owned by each vessel-owning entity (in vessels)       1fro_NumberOfVesselsOwnedByEachVesselOwningEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember		        
Number of entities owning an option to acquire a VLCC (in entities)       1fro_NumberOfEntitiesOwningOptionToAcquireVlcc
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember		        
Number of shares retained in Ship Finance retained after distribution to shareholders (in shares)         73,383fro_NumberOfSharesRetained
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember		      
Percent of total shares retained (in hundredths)         0.01%fro_PercentOfTotalSharesRetained
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_ShipFinanceInternationalLimitedMember		      
Independent Tankers Corporation Limited [Member]                
Related Party Transaction [Line Items]                
Percentage of subsidiary's or equity investee's stock owned by parent company sold in transaction (in hundredths)           17.53%fro_SaleOfStockPercentageOfOwnershipSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_IndependentTankersCorporationLimitedMember		    
Frontline 2012 Ltd [Member]                
Related Party Transaction [Line Items]                
Number of wholly-owned special purpose companies sold to Frontline 2012 (in number of subsidiaries)               15fro_NumberOfWhollyOwnedSpecialPurposeCompaniesSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Number of VLCC newbuilding contracts owned by the special purpose companies which have been sold to Frontline 2012 (in number of vessels)               5fro_NumberOfVlccNewbuildingContractsOwnedBySpecialPurposeCompaniesWhichHaveBeenSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Number of VLCCs owned by the special purpose companies which have been sold to Frontline 2012 (in number of vessels)               6fro_NumberOfVlccsOwnedBySpecialPurposeCompaniesWhichHaveBeenSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Number of VLCC's owned with a time charters attached which have been sold to Frontline 2012 (in number of vessels)               1fro_NumberOfVlccsOwnedWithTimeChartersAttachedWhichHaveBeenSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Number of Suezmax tankers owned by the special purpose companies which have been sold to Frontline 2012 (in number of vessels)               4fro_NumberOfSuezmaxTankersOwnedBySpecialPurposeCompaniesWhichHaveBeenSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember
Loss on sale of special purpose companies             $ (307.0)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fro_Frontline2012LtdMember