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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 2 Months Ended | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 06, 2014 | Dec. 31, 2012 | May 27, 2004 | Apr. 11, 2013 | Dec. 21, 2012 | Jan. 13, 2006 | Aug. 21, 2006 | Mar. 13, 2014 | Mar. 01, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost associated with the redemptions | $ 0 us-gaap_PreferredStockRedemptionPremium | $ 0 us-gaap_PreferredStockRedemptionPremium | $ 0 us-gaap_PreferredStockRedemptionPremium | $ 1,462 us-gaap_PreferredStockRedemptionPremium | $ 0 us-gaap_PreferredStockRedemptionPremium | $ 2,121 us-gaap_PreferredStockRedemptionPremium | $ 3,546 us-gaap_PreferredStockRedemptionPremium | $ 0 us-gaap_PreferredStockRedemptionPremium | $ 1,462 us-gaap_PreferredStockRedemptionPremium | $ 5,667 us-gaap_PreferredStockRedemptionPremium |  | $ 1,804 us-gaap_PreferredStockRedemptionPremium |  |  |  |  |  |  |  |  |
Preferred stock shares authorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |  |  | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest reclassified to equity |  |  |  |  |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of common stock |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock | 174,081 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 134,905 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Depositary Share percentage per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%fr_DepositarySharePercentagePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Dividend rate per share |  |  |  |  |  |  |  |  | 6.236%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  | 6.275%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |  |  |
Par value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Initial offering price per depository share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 fr_InitialOfferingPricePerDepositoryShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Aggregate redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |
Dividend per Depositary share |  |  |  | $ 11.3299 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total dividends, Depositary Shares |  |  |  | 566 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost associated with the redemptions |  |  |  |  |  |  |  |  | 949 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Minimum fixed coupon rate of preferred stock | 2.375%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |
Series G Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |
Depositary Share percentage per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%fr_DepositarySharePercentagePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |
Dividend rate per share |  |  |  |  |  |  |  |  | 7.236%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Par value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |
Initial offering price per depository share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 fr_InitialOfferingPricePerDepositoryShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |
Aggregate redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |
Dividend per Depositary share |  |  |  | $ 36.18 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total dividends, Depositary Shares |  |  |  | 905 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost associated with the redemptions |  |  |  |  |  |  |  |  | 513 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Series J Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |
Depositary Share percentage per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.01%fr_DepositarySharePercentagePerShare / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |
Dividend rate per share |  |  |  |  |  |  |  |  | 7.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Par value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |
Initial offering price per depository share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 fr_InitialOfferingPricePerDepositoryShare / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |
Aggregate redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |
Dividend per Depositary share |  |  |  |  |  |  | $ 0.055382 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  | $ 0.5085 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember | [1] | $ 2.2657 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  | $ 0.407812 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |  |  |  |  |
Total dividends, Depositary Shares |  |  |  |  |  |  | 221 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |  |  |  |  | 816 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |  |  |  |  |
Cost associated with the redemptions |  |  |  |  |  |  |  |  |  | 3,546 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  | 1,804 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |  |  |  |  |  |  |
Depositary Shares redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember | 2,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |  |  |  |
Series K Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |
Depositary Share percentage per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.01%fr_DepositarySharePercentagePerShare / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |
Dividend rate per share |  |  |  |  |  |  |  |  | 7.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Par value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |
Initial offering price per depository share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 fr_InitialOfferingPricePerDepositoryShare / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |
Aggregate redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |
Dividend per Depositary share |  |  |  |  |  | $ 0.090625 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |  |  | $ 0.9969 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember | [2] | $ 2.2657 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |  |  |  |  |  |  |  |
Total dividends, Depositary Shares |  |  |  |  |  | 181 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost associated with the redemptions |  |  |  |  |  |  |  |  |  | 2,121 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  | 8,400,000 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 9,400,000 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of common stock |  |  |  |  |  |  |  |  |  | 132,050 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 116,715 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Convertible Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units converted to common stock |  |  |  |  |  |  |  |  | 222,676 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember | 105,028 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember |  | 535,026 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember |  |  |  |  |  |  |  |  |
Noncontrolling interest reclassified to equity |  |  |  |  |  |  |  |  | 2,155 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember | 996 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember |  | 4,763 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertibleCommonStockMember |  |  |  |  |  |  |  |  |
ATM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  | 2,315,704 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember |  | 1,532,598 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of common stock |  |  |  |  |  |  |  |  |  | 41,735 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember |  | 18,063 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember |  |  |  |  |  |  |  |  |
Shares of company stock issuable under an at-the-market offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,300,000 fr_SaleableCompanyCommonStock / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember | 12,500,000 fr_SaleableCompanyCommonStock / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember
Aggregate gross sale proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 fr_AggregateGrossSaleProceeds / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember | $ 125,000 fr_AggregateGrossSaleProceeds / us-gaap_SubsidiarySaleOfStockAxis = fr_AtmMember
[1] | The remaining 4,000,000 Depositary Shares of the Series J Preferred Stock were redeemed on April 11, 2013. The 2013 redemption had no impact on the 2012 allocation included in the table above.
[2] | Schedule relates to the 2,000,000 Depositary Shares of the Series K Preferred Stock that were redeemed on July 18, 2013. The 2013 redemption had no impact on the 2012 allocation included in the table above.

X
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X
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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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