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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
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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