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Derivatives - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 2 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 06, 2014 | Jan. 29, 2014 | Aug. 01, 2014 | Oct. 31, 2008
Derivative [Line Items] |  |  |  |  |  |  |
Mark-to-Market Gain on Interest Rate Protection Agreements | $ 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ 52 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ (328)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |  |  |  |
Settlement payments of mark-to-market gains or losses |  | 774 fr_SettlementPaymentsOfMarkToMarketGainsOrLosses |  |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Minimum fixed coupon rate of preferred stock | 2.375%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Number of years of U.S. treasury rate one |  |  |  | 30 years |  |  |
Number of years of U.S. treasury rate two |  |  |  | 10 years |  |  |
LIBOR rate |  |  |  | 3-month LIBOR |  |  |
New coupon rate of preferred stock | 6.236%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  | 6.275%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |
Group I Swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Swaps, Number of Instruments Held |  |  |  |  | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = fr_InterestRateSwapOneMember |  |
Swaps, Notional Amount |  |  |  |  | 200,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fr_InterestRateSwapOneMember |  |
Swaps, Average Fixed Interest Rate |  |  |  |  | 2.29%us-gaap_DerivativeAverageFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = fr_InterestRateSwapOneMember |  |
Group II Swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Swaps, Number of Instruments Held |  |  |  |  |  | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = fr_InterestRateSwapTwoMember |
Swaps, Notional Amount |  |  |  |  |  | 220,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fr_InterestRateSwapTwoMember |
Swaps, Average Fixed Interest Rate |  |  |  |  |  | 2.5795%us-gaap_DerivativeAverageFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = fr_InterestRateSwapTwoMember |
Series F Agreement |  |  |  |  |  |  |
Derivative [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
Swaps, Average Fixed Interest Rate |  |  |  |  |  |  | 5.2175%us-gaap_DerivativeAverageFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

X
- Definition One of three rates for which the highest of the three rates is the adjustable component of the dividend rate which is added to the fixed component to determine the overall dividend rate. + References No definition available. + Details
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X
- Definition One of three rates for which the highest of the three rates is the adjustable component of the dividend rate which is added to the fixed component to determine the overall dividend rate. + References No definition available. + Details
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- Definition Settlement payments of mark to market gains or losses + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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Data Type: | num:percentItemType
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X
- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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X
- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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