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TRADE ACCOUNTS RECEIVABLE, NET (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$ (9,912)us-gaap_AllowanceForDoubtfulAccountsReceivable	$ (9,857)us-gaap_AllowanceForDoubtfulAccountsReceivable	$ (4,487)us-gaap_AllowanceForDoubtfulAccountsReceivable
Additions charged to income	(68)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	(55)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	(6,033)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Deductions credited to income			663fro_ReleaseOfAllowanceForDoubtfulAccounts
Ending balance	$ (9,980)us-gaap_AllowanceForDoubtfulAccountsReceivable	$ (9,912)us-gaap_AllowanceForDoubtfulAccountsReceivable	$ (9,857)us-gaap_AllowanceForDoubtfulAccountsReceivable

X

- Definition

Release of allowance for doubtful accounts

+ References

No definition available.

+ Details

Name:	fro_ReleaseOfAllowanceForDoubtfulAccounts
Namespace Prefix:	fro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the allowance for doubtful accounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

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