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SHARE CAPITAL (Details) (USD $) | 12 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Oct. 31, 2014 | Oct. 31, 2013 | Sep. 19, 2014 | May 14, 2013 | Jun. 30, 2013
Authorized share capital [Abstract] |  |  |  |  |  |  |  |  |
Ordinary shares authorized (in shares) | 1,000,000,000 us-gaap_CommonStockSharesAuthorized | 312,500,000 us-gaap_CommonStockSharesAuthorized |  | 1,000,000,000 us-gaap_CommonStockSharesAuthorized |  |  | 312,500,000 us-gaap_CommonStockSharesAuthorized |  |
Ordinary shares authorized - par value (in dollars per share) | $ 1 us-gaap_CommonStockParOrStatedValuePerShare | $ 1 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 1 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |
Ordinary shares authorized | $ 1,000,000,000 fro_CommonStockValueAuthorized | $ 312,500,000 fro_CommonStockValueAuthorized |  | $ 1,000,000,000 fro_CommonStockValueAuthorized |  |  | $ 312,500,000 fro_CommonStockValueAuthorized |  |
Issued and fully paid share capital [Abstract] |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) | 112,342,989 us-gaap_CommonStockSharesOutstanding | 86,511,713 us-gaap_CommonStockSharesOutstanding |  | 112,342,989 us-gaap_CommonStockSharesOutstanding |  |  |  |  |
Ordinary shares issued (dollars per share) | $ 1 us-gaap_CommonStockParOrStatedValuePerShare | $ 1 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 1 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |
Common Stock, Value, Issued | 112,343,000 us-gaap_CommonStockValue | 86,512,000 us-gaap_CommonStockValue |  | 112,343,000 us-gaap_CommonStockValue |  |  |  |  |
Additional Paid in Capital [Abstract] |  |  |  |  |  |  |  |  |
ATM Offering Maximum Aggregate Sales Proceeds | 100,000,000 fro_ATMOfferingMaximumAggregateSalesProceeds |  |  | 100,000,000 fro_ATMOfferingMaximumAggregateSalesProceeds |  |  |  |  |
Net proceeds from issuance of shares | 52,934,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 4,802,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |
Debt Conversion, Cash Payment | 10,000,000 fro_DebtConversionCashPayment |  |  |  |  |  |  |  |
Special General Meeting [Member] |  |  |  |  |  |  |  |  |
Authorized share capital [Abstract] |  |  |  |  |  |  |  |  |
Ordinary shares authorized (in shares) |  |  |  |  |  |  |  | 312,500,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
Ordinary shares authorized - par value (in dollars per share) | $ 2.50 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |  |  | $ 2.50 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |  |  | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
Ordinary shares authorized |  |  |  |  |  |  |  | 312,500,000 fro_CommonStockValueAuthorized / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
Issued and fully paid share capital [Abstract] |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  |  |  |  |  |  | 77,858,502 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
Ordinary shares issued (dollars per share) | $ 2.50 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |  |  | $ 2.50 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |  |  | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
Common Stock, Value, Issued |  | 194,646,255 us-gaap_CommonStockValue / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |  |  |  |  |  | 77,858,502 us-gaap_CommonStockValue / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
Common Stock Value Per Share Canceled |  |  |  |  |  |  |  | $ 1.50 fro_CommonStockValuePerShareCanceled / us-gaap_StatementEquityComponentsAxis = fro_SpecialGeneralMeetingMember |
At-The-Market Offering [Member] |  |  |  |  |  |  |  |  |
Additional Paid in Capital [Abstract] |  |  |  |  |  |  |  |  |
ATM Offering Maximum Aggregate Sales Proceeds | 40,000,000 fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember |  |  | 40,000,000 fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember |  |  |  |  | 40,000,000 fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember
Shares issued | 12,834,800 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember | 2,178,384 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember |  |  |  |  |  |  |
Net proceeds from issuance of shares | 54,200,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember | 6,200,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember |  |  |  |  |  |  |
Debt Conversion [Member] |  |  |  |  |  |  |  |  |
Additional Paid in Capital [Abstract] |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  | 22,500,000 us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember | 23,000,000 us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember | 25,000,000 us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  | 4,744,752 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember | 8,251,724 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember | 6,474,827 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember |  |  |
Debt Conversion, Cash Payment | 9,600,000 fro_DebtConversionCashPayment / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember |  |  |  |  | 2,250,000 fro_DebtConversionCashPayment / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember |  |  |
Adjustment to Additional Paid in Capital, Debt Conversion with Inducement Offer |  |  |  | 28,600,000 fro_AdjustmenttoAdditionalPaidinCapitalDebtConversionwithInducementOffer / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember | 25,400,000 fro_AdjustmenttoAdditionalPaidinCapitalDebtConversionwithInducementOffer / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember | 28,900,000 fro_AdjustmenttoAdditionalPaidinCapitalDebtConversionwithInducementOffer / us-gaap_StatementEquityComponentsAxis = fro_DebtConversionMember |  |  |
Annual General Meeting [Member] |  |  |  |  |  |  |  |  |
Authorized share capital [Abstract] |  |  |  |  |  |  |  |  |
Ordinary shares authorized (in shares) |  |  |  |  |  |  | 1,000,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = fro_AnnualGeneralMeetingMember |  |
Ordinary shares authorized |  |  |  |  |  |  | $ 1,000,000,000 fro_CommonStockValueAuthorized / us-gaap_StatementEquityComponentsAxis = fro_AnnualGeneralMeetingMember |  |

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