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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		$ 100,000,000fro_ATMOfferingMaximumAggregateSalesProceeds								$ 100,000,000fro_ATMOfferingMaximumAggregateSalesProceeds
Net proceeds from issuance of shares		52,934,000us-gaap_ProceedsFromIssuanceOfCommonStock	4,802,000us-gaap_ProceedsFromIssuanceOfCommonStock	0us-gaap_ProceedsFromIssuanceOfCommonStock
Shares issued		(70,649,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	(18,051,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	131,149,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest						(70,649,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ordinary shares issued (in shares)		112,342,989us-gaap_CommonStockSharesOutstanding	86,511,713us-gaap_CommonStockSharesOutstanding							112,342,989us-gaap_CommonStockSharesOutstanding
Repayments of Debt		54,732,000us-gaap_RepaymentsOfDebt	21,531,000us-gaap_RepaymentsOfDebt	19,521,000us-gaap_RepaymentsOfDebt
Repurchase of debt carrying value	17,800,000fro_RepurchaseOfDebtCarryingValue			(10,000,000)fro_RepurchaseOfDebtCarryingValue
Subsequent Event [Member]
Subsequent Event [Line Items]
ATM Offering Maximum Aggregate Sales Proceeds						150,000,000fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Ordinary shares issued (in shares)													123,255,436us-gaap_CommonStockSharesOutstanding / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Repurchase of debt carrying value					33,300,000fro_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					4,100,000us-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		40,000,000fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember								40,000,000fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember				40,000,000fro_ATMOfferingMaximumAggregateSalesProceeds / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember
Shares issued		12,834,800us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember	2,178,384us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember
Net proceeds from issuance of shares		54,200,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember	6,200,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember
At-The-Market Offering [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares issued					902,744us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	10,009,703us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Net proceeds from issuance of shares							37,200,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fro_AtTheMarketOfferingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common Stock [Member]
Subsequent Event [Line Items]
Shares issued		25,831,276us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	8,653,211us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	0us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Shares issued		112,343,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	86,512,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	194,646,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						112,343,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember					194,646,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Ordinary shares issued (in shares)		112,342,989us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	86,511,713us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	77,858,502us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						112,342,989us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember					77,858,502us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares issued													123,255,436us-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					222,000fro_StockDividendsSharesExpectedtobeReceived / us-gaap_CounterpartyNameAxis = fro_AvanceGasMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Convertible Debt [Member]
Subsequent Event [Line Items]
Repurchase of debt carrying value								10,000,000fro_RepurchaseOfDebtCarryingValue / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember
Gain (Loss) on Repurchase of Debt Instrument	1,500,000us-gaap_GainLossOnRepurchaseOfDebtInstrument / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember								4,600,000us-gaap_GainLossOnRepurchaseOfDebtInstrument / fro_LongTermDebtInterestRateTypeAxis = us-gaap_ConvertibleDebtMember
Convertible Debt [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Gain (Loss) on Repurchase of Debt Instrument							300,000us-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										60,000,000fro_FrontUllFrontIdunLoan / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember
US Dollar denominated floating rate debt [Member] | Front UII [Member]
Subsequent Event [Line Items]
Loan draw downs											30,000,000fro_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						30,000,000fro_DrawdownofFrontUllFrontIdunloan / fro_CollateralByTypeAxis = fro_FrontUIIMember / fro_LongTermDebtInterestRateTypeAxis = fro_UsDollarDenominatedFloatingRateDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	30,000,000fro_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						36,700,000us-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										60,000,000fro_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												60,000,000fro_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						60,000,000fro_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																$ 75,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fro_Frontline2012LtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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