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Investment in Real Estate - Fair Value Measurements on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |
Long-lived Assets Sold Impairment | $ (1,511) | [1]
Long Lived Assets Held And Used Impairment | (39) | [1]
Long-lived Assets Impairment | (1,550) |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |
Long-Lived Assets Held for Sale or Sold | 0 | [1]
Long-lived Assets Held and Used | 0 | [1]
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |
Long-Lived Assets Held for Sale or Sold | 0 | [1]
Long-lived Assets Held and Used | 0 | [1]
Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |
Long-Lived Assets Held for Sale or Sold | 28,457 | [1]
Long-lived Assets Held and Used | 8,303 | [1]
Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |  |
Long-Lived Assets Held for Sale or Sold | 28,457 | [1]
Long-lived Assets Held and Used | $ 8,303 | [1]
[1] | Excludes industrial properties for which an impairment reversal of $304 was recorded during the three months ended March 31, 2012, since the related assets are recorded at carrying value, which is lower than estimated fair value at March 31, 2012.

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- Definition Long-lived assets sold fair value disclosure. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Long lived assets held and used impairment. + References No definition available. + Details
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- Definition Long lived assets impairment. + References No definition available. + Details
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Balance Type: | debit
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- Definition Long Lived Assets Sold Impairment. + References No definition available. + Details
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Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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