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SUBSEQUENT EVENTS (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2015 | Jan. 31, 2015 | Mar. 31, 2015 | Mar. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 13, 2015 | Jun. 30, 2013 | Dec. 31, 2011 | Mar. 06, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | (70,649,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | (18,051,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 131,149,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  | (70,649,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  |
Ordinary shares issued (in shares) |  | 112,342,989 us-gaap_CommonStockSharesOutstanding | 86,511,713 us-gaap_CommonStockSharesOutstanding |  |  |  |  |  |  | 112,342,989 us-gaap_CommonStockSharesOutstanding |  |  |  |  |  |
Repayments of Debt |  | 54,732,000 us-gaap_RepaymentsOfDebt | 21,531,000 us-gaap_RepaymentsOfDebt | 19,521,000 us-gaap_RepaymentsOfDebt |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of debt carrying value | 17,800,000 fro_RepurchaseOfDebtCarryingValue |  |  | (10,000,000)fro_RepurchaseOfDebtCarryingValue |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Offering Maximum Aggregate Sales Proceeds |  |  |  |  |  | 150,000,000 fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 123,255,436 us-gaap_CommonStockSharesOutstanding / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Repurchase of debt carrying value |  |  |  |  | 33,300,000 fro_RepurchaseOfDebtCarryingValue / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |
Repurchase of debt against nominal value |  |  |  |  | 99.00%fro_Repurchaseofdebtagainstnominalvalue / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Frontline 2012 Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Dividends, Shares |  |  |  |  | 4,100,000 us-gaap_StockDividendsShares / dei_LegalEntityAxis = fro_Frontline2012LtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |
At-The-Market Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
At-The-Market Offering [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  | 902,744 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 10,009,703 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of shares |  |  |  |  |  |  | 37,200,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 25,831,276 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,653,211 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 112,343,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 86,512,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 194,646,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 112,343,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 194,646,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Ordinary shares issued (in shares) |  | 112,342,989 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 86,511,713 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 77,858,502 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 112,342,989 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 77,858,502 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 123,255,436 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Avance Gas [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock expected to be received |  |  |  |  | 222,000 fro_StockDividendsSharesExpectedtobeReceived / us-gaap_CounterpartyNameAxis = fro_AvanceGasMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of debt carrying value |  |  |  |  |  |  |  | 10,000,000 fro_RepurchaseOfDebtCarryingValue / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |  |  |  |
Gain (Loss) on Repurchase of Debt Instrument | 1,500,000 us-gaap_GainLossOnRepurchaseOfDebtInstrument / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |  |  |  | 4,600,000 us-gaap_GainLossOnRepurchaseOfDebtInstrument / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |  |  |
Convertible Debt [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Repurchase of Debt Instrument |  |  |  |  |  |  | 300,000 us-gaap_GainLossOnRepurchaseOfDebtInstrument / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Front Ull & Front Idun Loan |  |  |  |  |  |  |  |  |  | 60,000,000 fro_FrontUllFrontIdunLoan / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember |  |  |  |  |  |
US Dollar denominated floating rate debt [Member] | Front UII [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan draw downs |  |  |  |  |  |  |  |  |  |  | 30,000,000 fro_DrawdownofFrontUllFrontIdunloan / fro_CollateralByTypeAxis = fro_FrontUIIMember / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember |  |  |  |  |
US Dollar denominated floating rate debt [Member] | Front UII [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan draw downs |  |  |  |  |  | 30,000,000 fro_DrawdownofFrontUllFrontIdunloan / fro_CollateralByTypeAxis = fro_FrontUIIMember / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 30,000,000 fro_DrawdownofFrontUllFrontIdunloan / fro_CollateralByTypeAxis = fro_FrontUIIMember / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |
First Preferred Mortgage Term Notes due 2019 and 2021 [Member] | Subsequent Event [Member] | International Tankers Corporation Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  | 36,700,000 us-gaap_RepaymentsOfDebt / dei_LegalEntityAxis = fro_InternationalTankersCorporationLtdMember / us-gaap_LongtermDebtTypeAxis = fro_FirstPreferredMortgageTermNotesDue2019And2021Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt [Member] | US Dollar denominated floating rate debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Front Ull & Front Idun Loan |  |  |  |  |  |  |  |  |  | 60,000,000 fro_FrontUllFrontIdunLoan / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_LongtermDebtTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember |  |  |  |  |  |
US Dollar denominated floating rate debt [Member] | US Dollar denominated floating rate debt [Member] | Vessels by Name [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Front Ull & Front Idun Loan |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 fro_FrontUllFrontIdunLoan / fro_CollateralByTypeAxis = fro_VesselsByNameMember / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_LongtermDebtTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember |  |  |  |
US Dollar denominated floating rate debt [Member] | US Dollar denominated floating rate debt [Member] | Vessels by Name [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Front Ull & Front Idun Loan |  |  |  |  |  | 60,000,000 fro_FrontUllFrontIdunLoan / fro_CollateralByTypeAxis = fro_VesselsByNameMember / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_LongtermDebtTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |
Frontline 2012 Ltd [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Repurchase Agreement, Description of Investments Subject to Agreement |  |  |  |  |  | 13460000 |  |  |  |  |  |  |  |  |  |
Forward contract maximum maturity |  |  |  |  |  | P6M |  |  |  |  |  |  |  |  |  |
Forward contract percentage threshold |  |  |  |  |  | 20.00%fro_ForwardContractIndexedtoIssuersEquityMaintainCashDepositPledgedasCollateralasPercentageofForwardContractMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fro_Frontline2012LtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |
Common Stock, Value, Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fro_Frontline2012LtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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