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Subsequent Events - Additional Information (Detail) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 30, 2015 USD ($) Property | Sep. 30, 2015 USD ($) Property | Sep. 30, 2014 USD ($)
Subsequent Event [Line Items] |  |  |
Number of industrial properties acquired |  | 3 |
Purchase price of acquisitions | $ |  | $ 73,179 | $ 53,211
Number of industrial properties sold |  | 15 |
Proceeds from the sale of industrial properties | $ |  | $ 50,060 |
Subsequent Events |  |  |
Subsequent Event [Line Items] |  |  |
Number of industrial properties acquired | 3 |  |
Number of land parcels acquired | 2 |  |
Purchase price of acquisitions | $ | $ 71,177 |  |
Number of industrial properties sold | 29 |  |
Proceeds from the sale of industrial properties | $ | $ 28,225 |  |
Extinguishment of mortgage debt | $ | $ 22,910 |  |

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- Definition Number of industrial properties sold. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number Of Land Parcels Acquired + References No definition available. + Details
Name: | fr_NumberOfLandParcelsAcquired
Namespace Prefix: | fr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross amount of debt extinguished. + References No definition available. + 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 cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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Balance Type: | credit
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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=56944662&loc=d3e3179-108585 + Details
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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
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- Details
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