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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 |  | 1 fro_NumberOfVesselsDisposedOf |  |  |  |  |  |
Number of tanker sizes |  |  | 2 fro_NumberOfTankerSizes |  |  |  |  |
Lower range of VLCC tanker size (in dry weight tonnage) |  |  | 200,000 fro_VlccTankerSizeRangeMinimum |  |  |  |  |
Upper range of VLCC tanker size ((in dry weight tonnage) |  |  | 320,000 fro_VlccTankerSizeRangeMaximum |  |  |  |  |
Lower range of Suezmax tanker size (in dry weight tonnage) |  |  | 120,000 fro_SuezmaxTankerSizeRangeMinimum |  |  |  |  |
Upper range of Suezmax tanker size (in dry weight tonnage) |  |  | 170,000 fro_SuezmaxTankerSizeRangeMaximum |  |  |  |  |
Number of vessels the gross charter payment commitment was reduced (in number of vessels) |  |  |  |  |  |  |  | 32 fro_NumberOfVesselsGrossCharterPaymentCommitmentWasReduced
Number of vessels owned through ITCL | 4 fro_NumberOfVesselsOwnedThroughItcl |  |  |  |  |  |  |
Ship Finance International Limited [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of vessel-owning entities sold to Ship Finance (in entities) |  |  |  | 46 fro_NumberOfVesselOwningEntitiesTransferred / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Number of vessels owned by each vessel-owning entity (in vessels) |  |  |  | 1 fro_NumberOfVesselsOwnedByEachVesselOwningEntity / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Number of entities owning an option to acquire a VLCC (in entities) |  |  |  | 1 fro_NumberOfEntitiesOwningOptionToAcquireVlcc / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  |  |  |
Number of shares retained in Ship Finance retained after distribution to shareholders (in shares) |  |  |  |  | 73,383 fro_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) |  |  |  |  |  |  |  | 15 fro_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) |  |  |  |  |  |  |  | 5 fro_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) |  |  |  |  |  |  |  | 6 fro_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) |  |  |  |  |  |  |  | 1 fro_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) |  |  |  |  |  |  |  | 4 fro_NumberOfSuezmaxTankersOwnedBySpecialPurposeCompaniesWhichHaveBeenSold / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember
Loss on sale of special purpose companies |  |  |  |  |  |  | $ (307.0)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_Frontline2012LtdMember |

X
- Definition Number of entities owning an option to acquire a VLCC + References No definition available. + Details
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- Definition Number of shares retained after distribution to shareholders. + References No definition available. + Details
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- Definition Number of Suezmax tankers owned by the special purpose companies which have been sold to Frontline 2012. + References No definition available. + Details
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X
- Definition The number of sizes of tankers the Company operates. + References No definition available. + Details
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Balance Type: | na
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- Definition Number of vessel-owning entities sold. + References No definition available. + Details
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- Definition Number Of Vessels Disposed Of + References No definition available. + Details
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- Definition Represents the number of vessels the gross charter payment commitment was reduced. + References No definition available. + Details
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- Definition Number of vessels owned through ITCL. + References No definition available. + Details
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- Definition Number of VLCC newbuilding contracts owned by the special purpose companies which have been sold to Frontline 2012. + References No definition available. + Details
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- Definition Number of VLCCs owned by the special purpose companies which have been sold to Frontline 2012. + References No definition available. + Details
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- Definition Number of VLCC's owned with a time charters attached which have been sold to Frontline 2012. + References No definition available. + Details
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- Definition Number of wholly-owned special purpose companies sold to Frontline 2012. + References No definition available. + Details
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- Definition The maximum size, in dwt, of the Company's Suezmax tankers. + References No definition available. + Details
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Namespace Prefix: | fro_
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