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DISCONTINUED OPERATIONS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Mar. 31, 2013 capital_lease	Dec. 31, 2014 vessel	Dec. 31, 2013	Dec. 31, 2012 vessel	Dec. 31, 2012 vessel
Operating revenues		$ 559,688us-gaap_Revenues	$ 517,190us-gaap_Revenues	$ 578,361us-gaap_Revenues
Loss on sale of assets		(24,620)fro_GainLossOnSaleOfAssets	(23,558)fro_GainLossOnSaleOfAssets	(34,759)fro_GainLossOnSaleOfAssets
Contingent rental expense (income)		4,237fro_ContingentRentalIncomeExpense	(8,726)fro_ContingentRentalIncomeExpense	0fro_ContingentRentalIncomeExpense
Impairment of vessels			103,700us-gaap_TangibleAssetImpairmentCharges	32,000us-gaap_TangibleAssetImpairmentCharges
Net loss from discontinued operations		0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(1,204)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(12,544)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Number of vessels disposed of	1fro_NumberOfVesselsDisposedOf
Number of vessels impaired		1fro_NumberOfVesselsImpaired		5fro_NumberOfVesselsImpaired
OBO [Member]
Impairment of vessels				27,300us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByTypeAxis = fro_OboMember
Number of vessels disposed of					2fro_NumberOfVesselsDisposedOf / fro_VesselsByTypeAxis = fro_OboMember
Number of vessels impaired				4fro_NumberOfVesselsImpaired / fro_VesselsByTypeAxis = fro_OboMember
Number of vessels whose lease was terminated			1fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_OboMember	3fro_Numberofvesselswhoseleasewasterminated / fro_VesselsByTypeAxis = fro_OboMember
Front Rider [Member]
Impairment of vessels				4,900us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontRiderMember
Front Climber [Member]
Impairment of vessels				4,200us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontClimberMember
Front Driver [Member]
Impairment of vessels				4,000us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontDriverMember
Front Guider [Member]
Impairment of vessels				14,200us-gaap_TangibleAssetImpairmentCharges / fro_VesselsByNameAxis = fro_FrontGuiderMember
Discontinued Operations [Member]
Operating revenues		0us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	1,840us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	89,747us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Loss on sale of assets		0fro_GainLossOnSaleOfAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	(847)fro_GainLossOnSaleOfAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	(17,946)fro_GainLossOnSaleOfAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Contingent rental expense (income)		0fro_ContingentRentalIncomeExpense / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	0fro_ContingentRentalIncomeExpense / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	32,156fro_ContingentRentalIncomeExpense / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Impairment of vessels		$ 0us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	$ 0us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	$ 27,316us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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