XML 86 R68.htm IDEA: XBRL DOCUMENT
v3.20.4

Lessor Disclosures (Details) $ in Thousands, ft² in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($)
Lessor, Lease, Description [Line Items] |  |  |
Gross leasable area (GLA) of industrial properties | ft² | 62.8 |  |
Sales Type Lease |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Gross leasable area (GLA) of industrial properties | ft² |  | 0.6 |
Sales-type Lease, Selling Profit (Loss) | $ | $ 0 | $ 8,606 | $ 0
Sales-type Lease, Lease Receivable | $ | $ 0 | $ 54,521 | $ 0

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
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_LessorLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981 + Details
Name: | us-gaap_SalesTypeLeaseLeaseReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of profit (loss) recognized at commencement from sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=121640914&loc=SL77927221-108306 + Details
Name: | us-gaap_SalesTypeLeaseSellingProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | fr_SalesTypeLeaseAxis=fr_SalesTypeLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |