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Investment in Real Estate (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Summary of net non-cash impairment charges |  |
Total Net Impairment | $ 1,246 | $ (52)
Operating Properties - Held for Sale and Sold Assets [Member] |  |
Summary of net non-cash impairment charges |  |
Total Net Impairment | (1,260) | (2,727)
Impairment - Discontinued Operations [Member] |  |
Summary of net non-cash impairment charges |  |
Total Net Impairment | (1,260) | (2,727)
Land Parcels - Held for Sale and Sold Assets [Member] |  |
Summary of net non-cash impairment charges |  |
Total Net Impairment |  |
Operating Properties - Held for Use [Member] |  |
Summary of net non-cash impairment charges |  |
Total Net Impairment | 14 | 2,184
Land Parcels - Held for Use [Member] |  |
Summary of net non-cash impairment charges |  |
Total Net Impairment |  | 595
Impairment - Continuing Operations [Member] |  |
Summary of net non-cash impairment charges |  |
Total Net Impairment | $ 14 | $ 2,779

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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_RestructuringSettlementAndImpairmentProvisionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration