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Investment in Real Estate - Fair Value Measurements on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |
Long-lived Assets Held for Sale or Sold Impairment | $ (4,451)
Long-lived Assets Impairment | (7,017)
Long-lived Assets Held and Used Impairment | (2,566)
Impairment reversal of industrial properties and land parcels | 9,678
Estimate of Fair Value, Fair Value Disclosure [Member] |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |
Long-lived Assets Held for Sale or Sold | 23,252
Long-lived Assets Held and Used | 50,895
Fair Value, Measurements, Nonrecurring [Member] | 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 |
Long-lived Assets Held and Used |
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |
Long-lived Assets Held for Sale or Sold |
Long-lived Assets Held and Used |
Fair Value, Measurements, Nonrecurring [Member] | Unobservable Inputs (Level 3) [Member] |
Fair Value Assets Measured On Nonrecurring Basis [Line Items] |
Long-lived Assets Held for Sale or Sold | 23,252
Long-lived Assets Held and Used | $ 50,895

X
- Definition Long-lived assets that are held and used in normal operations. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | fr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impairment reversal of industrial properties and land parcels. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Long lived assets held and used impairment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Long lived assets held for sale impairment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Long-lived assets impairment. + References No definition available. + Details
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X
- Definition Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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