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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 29, 2014 | Dec. 14, 2011 | Jul. 19, 2013 | Oct. 31, 2008
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Loss from Retirement of Debt | $ (655)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ (6,637)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ (9,684)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |
Unamortized deferred financing cost, wrote off | 56 us-gaap_WriteOffOfDeferredDebtIssuanceCost |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 450,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Number of years of extension of line of credit facility at election | 1 year |  |  |  |  |  |
Line of credit facility, interest rate description | 150 |  |  |  |  |  |
2014 Notes |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 81,794 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandFourteenNotesMember |  |  |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 625,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = fr_UnsecuredCreditFacilityMember |
Line of credit facility, increase, additional borrowings | 825,000 fr_LineofCreditFacilityPotentialMaximumBorrowingCapacitySubjecttoCertainRestrictions / us-gaap_DebtInstrumentAxis = fr_UnsecuredCreditFacilityMember |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Loss from Retirement of Debt |  | 5,003 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fr_SeniorUnsecuredNotesMember |  |  |  |  |
Unamortized debt issue discount |  | 28 fr_DebtInstrumentsUnamortizedDiscount / us-gaap_DebtInstrumentAxis = fr_SeniorUnsecuredNotesMember |  |  |  |  |
Unamortized deferred financing cost, wrote off |  | 191 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = fr_SeniorUnsecuredNotesMember |  |  |  |  |
Unamortized settlement amount of interest rate protection agreements |  | 1,116 fr_UnamortizedSettlementAmountOfInterestRateProtectionAgreements / us-gaap_DebtInstrumentAxis = fr_SeniorUnsecuredNotesMember |  |  |  |  |
Mortgages |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 65,558 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 72,261 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |
Loss from Retirement of Debt | 655 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 1,578 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |
Carrying value of industrial properties held under mortgage | 740,281 us-gaap_DebtInstrumentCollateralAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Unsecured Term Loan, Term |  |  |  | 7 years |  |  |
Unsecured Term Loan, Face Amount |  |  |  | 200,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |
Interest Rate Swap |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Swaps, Notional Amount | $ 200,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  | $ 50,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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