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ACCOUNTING POLICIES 2 (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Special Purpose Entities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of vessels where rate reduction applies |  |  | 4 fro_NumberOfVesselsWhereRateReductionApplies / dei_LegalEntityAxis = fro_SpecialPurposeEntitiesMember
Ship Finance International Limited [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Agreed per day rate reduction | $ 6,500 fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember |  | $ 6,500 fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember
Length of period over which rate reduction applies |  | 4 years |
Compensation percentage of any difference between the renegotiated rates and actual market rate up to the original contract rates | 100.00%fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 100.00%fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember | 100.00%fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember

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- Definition Agreed per day rate reduction + References No definition available. + Details
Name: | fro_AgreedPerDayRateReduction
Namespace Prefix: | fro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Compensation percentage of any difference between the renegotiated rates and actual market rate up to the original contract rates + References No definition available. + Details
Name: | fro_CompensationPercentageOfAnyDifferenceBetweenRenegotiatedRatesAndActualMarketRateUpToOriginalContractRates
Namespace Prefix: | fro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The period covered by the change in lease rates. + References No definition available. + Details
Name: | fro_LengthOfPeriodOverWhichRateReductionApplies
Namespace Prefix: | fro_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of vessels where rate reduction applies + References No definition available. + Details
Name: | fro_NumberOfVesselsWhereRateReductionApplies
Namespace Prefix: | fro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=fro_SpecialPurposeEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fro_ShipFinanceInternationalLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |