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INVESTMENT IN FINANCE LEASE (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014 vessel	Dec. 31, 2013 vessel
Vessels Accounted for as Sales Type Leases [Abstract]
Number of vessels leased to third parties on time charter classified as investment in finance lease	1fro_NumberOfVesselsLeasedToThirdPartiesOnTimeCharterClassifiedAsInvestmentInFinanceLease	1fro_NumberOfVesselsLeasedToThirdPartiesOnTimeCharterClassifiedAsInvestmentInFinanceLease
Components of the investment in sales-type leases [Abstract]
Net minimum lease payments receivable	$ 67,145us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesMinimumPaymentsToBeReceived	$ 78,452us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesMinimumPaymentsToBeReceived
Estimated residual values of leased property (unguaranteed)	20,320us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty	20,320us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
Less: unearned income	(38,647)us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesDeferredIncome	(47,398)us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesDeferredIncome
Total investment in sales-type lease	48,818us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeases	51,374us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeases
Current portion	3,028us-gaap_CapitalLeasesLessorBalanceSheetNetInvestmentInSalesTypeLeasesCurrent	2,555us-gaap_CapitalLeasesLessorBalanceSheetNetInvestmentInSalesTypeLeasesCurrent
Long-term portion	45,790us-gaap_CapitalLeasesLessorBalanceSheetNetInvestmentInSalesTypeLeasesNoncurrent	48,819us-gaap_CapitalLeasesLessorBalanceSheetNetInvestmentInSalesTypeLeasesNoncurrent
Total investment in sales-type lease	48,818us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeases	51,374us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeases
Future minimum gross revenues [Abstract]
2015	11,307us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableCurrent
2016	11,338us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears
2017	11,307us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears
2018	11,307us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInFourYears
2019	11,307us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInFiveYears
Thereafter	10,579us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableDueThereafter
Total minimum lease revenues	$ 67,145us-gaap_CapitalLeasesFutureMinimumPaymentsReceivable

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Number of Vessels Leased to Third Parties on Time Charter Classified as Investment in Finance Lease

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Amount of minimum lease payments to be received by the lessor for capital leases.

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Amount of minimum lease payments to be received by the lessor for capital leases in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received by the lessor for capital leases after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received by the lessor for capital leases in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received by the lessor for capital leases in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received by the lessor for capital leases in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received by the lessor for capital leases in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The net amount due within one year of the balance sheet date or the normal operating cycle, if longer, consisting of: (a) minimum lease payments on sales type leases and (b) unguaranteed residual value; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The net amount due after one year of the balance sheet date or beyond the normal operating cycle, if longer, consisting of: (a) minimum lease payments on sales type leases, and (b) unguaranteed residual value; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The net investment in sales type leases as of the balance sheet date consisting of: (a) minimum lease payments on sales type leases and (b) unguaranteed residual value; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The remaining (unamortized) difference between the gross investment in a sales-type lease and the cost or carrying amount of the leased property as of the balance sheet date.

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Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under sales-type leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments.

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The estimate of the lease property's economic value at the end of the sales-type lease term excluding any amounts guaranteed by either the lessee or a third-party.

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