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Investment in Real Estate Quantitative Information About Level 3 Fair Value Measurements (Details) $ in Thousands | Jun. 30, 2018 USD ($) Property
--- | ---
Unobservable Inputs (Level 3) | ContractedPrice |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value of Industrial Property | $ | $ 1,889
Impairment Activity |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Number of Land Parcels | Property | 1

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- Definition Number of Land Parcels + References No definition available. + Details
Name: | fr_NumberofLandParcels
Namespace Prefix: | fr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=fr_ContractedPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fr_InvestmentinRealEstateActivityAxis=fr_ImpairmentActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |