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NEWBUILDINGS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2014 vessel
NEWBUILDINGS [Abstract]
Balance, beginning of period	$ 29,668us-gaap_ConstructionInProgressGross	$ 26,913us-gaap_ConstructionInProgressGross	$ 13,049us-gaap_ConstructionInProgressGross
Installments and newbuilding supervision fees paid	42,130fro_InstallmentsAndNewbuildingSupervisionFeesPaid	572fro_InstallmentsAndNewbuildingSupervisionFeesPaid	12,936fro_InstallmentsAndNewbuildingSupervisionFeesPaid
Interest capitalized	411us-gaap_InterestCostsCapitalized	2,183us-gaap_InterestCostsCapitalized	928us-gaap_InterestCostsCapitalized
Transfers to Vessels and Equipment	(56,740)fro_TransfersToVesselsAndEquipment
Balance, end of period	$ 15,469us-gaap_ConstructionInProgressGross	$ 29,668us-gaap_ConstructionInProgressGross	$ 26,913us-gaap_ConstructionInProgressGross
number of vessels swapped				2fro_Numberofvesselsswapped

X

- Definition

Additions to construction in progress for supervision fees paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	fro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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X

- Definition

number of vessels swapped

+ References

No definition available.

+ Details

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Namespace Prefix:	fro_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Current year reclassification from construction in progress to long-lived, physical assets used in the normal conduct of business and not intended for resale.

+ References

No definition available.

+ Details

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Namespace Prefix:	fro_
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Balance Type:	credit
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X

- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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X

- Definition

Amount of interest capitalized during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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