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Investments in Joint Ventures Condensed Combined Balance Sheets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Real Estate and Other Assets Held for Sale, Accumulated Depreciation and Amortization | $ 0 | $ 3,050
Corporate Joint Venture [Member] |  |
Real Estate and Other Assets Held for Sale, Accumulated Depreciation and Amortization | 40,387 | 0
Leasing Intangibles Held for Sale Accumulated Amortization | $ 3,208 | $ 0

X
- Definition The cumulative amount of amortization for the carrying amount as of the balance sheet date of leasing intangibles held for sale. + References No definition available. + Details
Name: | fr_LeasingIntangiblesHeldForSaleAccumulatedAmortization
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cumulative amount of depreciation and amortization for the carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | fr_RealEstateHeldForSaleAccumulatedDepreciationAndAmortization
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant