XML 67 R53.htm IDEA: XBRL DOCUMENT
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Subsequent Events - Additional Information (Details) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 25, 2018 USD ($) Property | Sep. 30, 2018 USD ($) Property
Subsequent Event [Line Items] |  |
Number of industrial properties owned |  | 468
Acquisition Activity |  |
Subsequent Event [Line Items] |  |
Number of industrial properties owned |  | 6
Purchase price of industrial properties acquired | $ |  | $ 101,941
Disposition Activity |  |
Subsequent Event [Line Items] |  |
Number of industrial properties owned |  | 34
Proceeds from sale of industrial properties | $ |  | $ 120,516
Subsequent Event | Acquisition Activity |  |
Subsequent Event [Line Items] |  |
Number of industrial properties owned | 1 |
Number of Land Parcels | 1 |
Purchase price of industrial properties acquired | $ | $ 16,606 |
Subsequent Event | Disposition Activity |  |
Subsequent Event [Line Items] |  |
Number of industrial properties owned | 1 |
Number of Land Parcels | 1 |
Proceeds from sale of industrial properties | $ | $ 8,325 |

X
- 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

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- Definition The amount of assets acquired. + References No definition available. + Details
Name: | fr_PurchasePrice
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The cash inflow from sale of buildings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfBuildings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |