XML 30 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Net Non-Cash Impairment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  | $ 2,520 | $ 1,246 | $ (2,303)
Operating Properties-Held for Sale and Sold Assets [Member] |  |  |  |
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  | 1,387 | 1,411 | 4,828
Impairment-Discontinued Operations [Member] |  |  |  |
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  | 1,387 | 1,411 | 4,828
Land Parcels - Sold Assets [Member] |  |  |  |
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  |  |  | (5,879)
Operating Properties - Held for Use [Member] |  |  |  |
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  | 1,173 | (165) | (617)
Land Parcels - Held for Use [Member] |  |  |  |
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  | (40) |  | (635)
Impairment - Continuing Operations [Member] |  |  |  |
Impairment Charges [Line Items] |  |  |  |
Total Net Impairment |  | $ 1,133 | $ (165) | $ (7,131)

X
- 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

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