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MARKETABLE SECURITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity securities available-for-sale
Cost	$ 2,830,000fro_AvailableForSaleSecuritiesEquitySecuritiesCurrentCost	$ 2,707,000fro_AvailableForSaleSecuritiesEquitySecuritiesCurrentCost
Accumulated net unrealized (loss) gain	(206,000)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	772,000us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Fair value	2,624,000us-gaap_AvailableForSaleSecuritiesEquitySecuritiesCurrent	3,479,000us-gaap_AvailableForSaleSecuritiesEquitySecuritiesCurrent
Unrealized gain (loss)	(200,000)us-gaap_MarketableSecuritiesUnrealizedGainLoss	800,000us-gaap_MarketableSecuritiesUnrealizedGainLoss
Avance Gas [Member]
Equity securities available-for-sale
Shares received		108,069fro_NumberOfAvailableForSaleShares / dei_LegalEntityAxis = fro_AvanceGasMember
Kightsbridge [Member]
Equity securities available-for-sale
Shares received	12,374fro_NumberOfAvailableForSaleShares / dei_LegalEntityAxis = fro_KightsbridgeMember	8,766fro_NumberOfAvailableForSaleShares / dei_LegalEntityAxis = fro_KightsbridgeMember
Payment for shares	0us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = fro_KightsbridgeMember
Income earned on shares	$ 10,000fro_MarketValueOfSharesRecordedAsIncome / dei_LegalEntityAxis = fro_KightsbridgeMember	$ 60,000fro_MarketValueOfSharesRecordedAsIncome / dei_LegalEntityAxis = fro_KightsbridgeMember

X

- Definition

The gross cost of equity securities categorized neither as held-to-maturity nor trading which are intended be sold within one year from the balance sheet date or the normal operating cycle, whichever is longer.

+ References

No definition available.

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- Definition

Market Value of Shares Recorded as Income

+ References

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- Definition

Number of available-for-sale shares

+ References

No definition available.

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- Definition

Amount of investments in equity securities and other forms of securities that provide ownership interests classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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- Definition

Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563



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- Definition

The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585



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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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