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Investment in Real Estate - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Property sqft | Dec. 31, 2013 sqft Property | Dec. 31, 2012 Property Parcels sqft
Real Estate [Line Items] |  |  |
Number of industrial properties acquired | 8 us-gaap_NumberOfBusinessesAcquired | 2 us-gaap_NumberOfBusinessesAcquired | 1 us-gaap_NumberOfBusinessesAcquired
Number of industrial properties acquired through acquisition of equity interest |  | 1 fr_NumberofIndustrialPropertiesWithWhollyOwnedEquityInterest |
Gross leasable area (GLA) of industrial properties acquired | 1,100,000 fr_SquareFootageOfRealEstatePropertiesAcquired | 1,100,000 fr_SquareFootageOfRealEstatePropertiesAcquired | 400,000 fr_SquareFootageOfRealEstatePropertiesAcquired
Equity interest acquired |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |
Number of industrial properties owned | 638 us-gaap_NumberOfRealEstateProperties |  |
Number of vacant industrial properties acquired |  | 1 fr_NumberofAcquiredIndustrialPropertiesVacant |
Purchase price of acquisitions | $ 95,692 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | $ 72,812 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | $ 21,819 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Fair value of mortgage loan assumed from acquisition |  |  | 12,026 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
Cash payment of acquisition |  |  | 8,324 us-gaap_PaymentsToAcquireBusinessesGross
Percentage of consideration paid of net fair value of acquisition |  |  | 85.00%fr_PercentageOfConsiderationPaidOfNetFairValueOfAcquisition
Gain on Change in Control of Interests | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 776 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Purchase price of land parcels | 39,739 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand | 34,518 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand | 46,695 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
Number of industrial properties sold | 29 fr_NumberOfIndustrialPropertiesSold | 67 fr_NumberOfIndustrialPropertiesSold | 28 fr_NumberOfIndustrialPropertiesSold
Gross leasable area (GLA) of industrial properties sold | 2,000,000 fr_SquareFootageOfIndustrialPropertiesSold | 3,000,000 fr_SquareFootageOfIndustrialPropertiesSold | 4,200,000 fr_SquareFootageOfIndustrialPropertiesSold
Number of land parcels sold |  |  | 1 fr_NumberOfLandParcelsSold
Proceeds from sale of industrial properties | 102,596 us-gaap_ProceedsFromSaleOfBuildings | 144,628 us-gaap_ProceedsFromSaleOfBuildings | 85,561 us-gaap_ProceedsFromSaleOfBuildings
Gain on sale of real estate | 25,905 us-gaap_GainLossOnSaleOfProperties | 35,444 us-gaap_GainLossOnSaleOfProperties | 16,442 us-gaap_GainLossOnSaleOfProperties
Gain on sale of real estate included in discontinued operations | 25,988 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 34,344 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 12,665 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Number of sold industrial properties included in discontinued operations | 29 fr_NumberOfSoldIndustrialPropertiesIncludedInDiscontinuedOperations | 67 fr_NumberOfSoldIndustrialPropertiesIncludedInDiscontinuedOperations | 28 fr_NumberOfSoldIndustrialPropertiesIncludedInDiscontinuedOperations
Notes receivable outstanding | 2,731 us-gaap_NotesReceivableNet | 52,605 us-gaap_NotesReceivableNet |
Net discount of notes receivable outstanding | 0 us-gaap_ReceivableWithImputedInterestDiscount | 191 us-gaap_ReceivableWithImputedInterestDiscount |
interest rate of notes receivable | 4.75%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate |  |
Fair value of notes receivable | $ 2,732 us-gaap_NotesReceivableFairValueDisclosure | $ 53,482 us-gaap_NotesReceivableFairValueDisclosure |
2003 Net Lease Joint Venture |  |  |
Real Estate [Line Items] |  |  |
Equity interest acquired |  |  | 85.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fr_TwoThousandThreeNetLeaseJointVentureMember
Number of industrial properties owned | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fr_TwoThousandThreeNetLeaseJointVentureMember |  | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fr_TwoThousandThreeNetLeaseJointVentureMember

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- Definition Number of Acquired Industrial Properties Vacant + References No definition available. + Details
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- Definition Number of industrial properties sold. + References No definition available. + Details
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- Definition Number of Industrial Properties With Wholly Owned Equity Interest + References No definition available. + Details
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- Definition Number Of Land Parcels Sold + References No definition available. + Details
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- Definition The number of sold industrial properties included in discontinued operations. + References No definition available. + Details
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- Definition Percentage of consideration paid of net fair value of acquisition. + References No definition available. + Details
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- Details
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- Definition Square footage of industrial properties sold. + References No definition available. + Details
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- Definition Square Footage of Real Estate Properties Acquired. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from sale of buildings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 + Details
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- Definition Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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