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Investment in Real Estate - Net Non-Cash Impairment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Impairment Charges [Line Items] |  |
Total Net Impairment | $ 0 | $ 1,246
Sold Operating Properties - Discontinued Operations |  |
Impairment Charges [Line Items] |  |
Total Net Impairment | 0 | 1,410
Held for Use Operating Properties - Continuing Operations |  |
Impairment Charges [Line Items] |  |
Total Net Impairment | $ 0 | $ (164)

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. Includes amounts in income from continuing operations and income from discontinued operations. + References No definition available. + Details
Name: | fr_ImpairmentOfRealEstateNet
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration