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

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- 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. + Details
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- Definition Market Value of Shares Recorded as Income + References No definition available. + Details
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- Definition Number of available-for-sale shares + References No definition available. + Details
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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 + Details
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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 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 + Details
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