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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