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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			4fro_NumberOfVesselsWhereRateReductionApplies / dei_LegalEntityAxis = fro_SpecialPurposeEntitiesMember
Ship Finance International Limited [Member]
Related Party Transaction [Line Items]
Agreed per day rate reduction	$ 6,500fro_AgreedPerDayRateReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fro_ShipFinanceInternationalLimitedMember		$ 6,500fro_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

X

- 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

X

- 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

X

- 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

X

- Details

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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: