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Subsequent Events - Additional Information (Details) - Acquisition Activity $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 26, 2018 USD ($) Property | Mar. 31, 2018 USD ($) Property
Subsequent Event [Line Items] |  |
Number of land parcels | Property |  | 1
Purchase price of industrial properties acquired | $ |  | $ 60,965
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Number of land parcels | Property | 1 |
Purchase price of industrial properties acquired | $ | $ 3,270 |
Subsequent Event | Joint Venture |  |
Subsequent Event [Line Items] |  |
Purchase price of industrial properties acquired | $ | $ 49,000 |
Number of acres | Property | 532 |
Equity Method Investment, Ownership Percentage | 49.00% |

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

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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

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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 percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |