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Organization and Formation of Company (Details Textual) | 2 Months Ended | 12 Months Ended
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Feb. 28, 2012 sqft IndustrialProperty State Province | Dec. 31, 2011 sqft JointVentures IndustrialProperty State Province
Organization and Formation of Company (Textual) [Abstract] |  |
Industrial property owned |  | 740
Number of states in which industrial properties are located |  | 26
Number of provinces in which industrial properties are located |  | 1
Gross Leasable Area (GLA) of industrial property owned | 400,000 | 66,300,000
Number of Joint Ventures |  | 2
Number of joint ventures in which company disposed off their equity interests |  | 5

X
- Definition The number of joint ventures that the entity owns a non-controlling interest in as of the balance sheet date. + References No definition available. + Details
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X
- Definition The number of joint ventures that the entity has sold their interest in during the period. + References No definition available. + Details
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Namespace Prefix: | fr_
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X
- Definition The number of provinces in Canada in which the entity operates as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | fr_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | fr_
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X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
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