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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Deferred Leasing Intangibles Included in Total Assets and Liabilities (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Accounting Policies [Abstract] |  |
Accumulated amortization, total assets | $ 30,017 | $ 36,327
Accumulated amortization, total liabilities | $ 8,240 | $ 9,389

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- Definition Accumulated Amortization Of Intangible Lease Assets + References No definition available. + Details
Name: | fr_AccumulatedAmortizationOfIntangibleLeaseAssets
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration