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Summary of Significant Accounting Policies - Deferred Leasing Intangibles Included in Total Liabilities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Liabilities [Line Items]
Accumulated Amortization,Total Liabilities	$ 9,389	$ 9,340

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- Definition

Accumulated Amortization Of Intangible Lease Liabilities

+ References

No definition available.

+ Details

Name:	fr_AccumulatedAmortizationOfIntangibleLeaseLiabilities
Namespace Prefix:	fr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	fr_FiniteLivedIntangibleLiabilitiesLineItems
Namespace Prefix:	fr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration