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Subsequent Events - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 1 Months Ended
--- | --- | ---
Jun. 30, 2014 Property | Jul. 29, 2014 Subsequent Event Parcels Property
Subsequent Event [Line Items] |  |
Number of industrial properties sold | 5 | 7
Number of land parcels sold |  | 1
Proceeds from sale of industrial properties and land parcel | $ 4,806 | $ 33,160

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- Definition Number of industrial properties sold. + References No definition available. + Details
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Namespace Prefix: | fr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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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=31042434&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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- Details
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Namespace Prefix: | us-gaap_
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