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FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 types_of_risk instrument	Dec. 31, 2013 instrument	Dec. 31, 2012 instrument
Fair Value Disclosures [Abstract]
Number of risks related to subsidiaries' reporting in foreign currency	2fro_NumberOfRisksRelatedToSubsidiariesReportingInForeignCurrency
Number of forward freight contracts entered into and outstanding for speculative purposes	0us-gaap_DerivativeNumberOfInstrumentsHeld	0us-gaap_DerivativeNumberOfInstrumentsHeld	24us-gaap_DerivativeNumberOfInstrumentsHeld
Mark to market of derivatives	$ 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax	$ 585us-gaap_GainLossOnDerivativeInstrumentsNetPretax	$ 1,725us-gaap_GainLossOnDerivativeInstrumentsNetPretax

X

- Definition

Number of risks related to company's subsidiaries' reporting in Sterling, Singapore dollars or Norwegian kroner currencies. Such risks include transaction risk and translation risk.

+ References

No definition available.

+ Details

Name:	fro_NumberOfRisksRelatedToSubsidiariesReportingInForeignCurrency
Namespace Prefix:	fro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

+ Details

Name:	us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration