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Organization and Formation of Company - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012 Joint_Ventures State Province sqft Property
Organization and Formation of Company [Line Items] |
Number of industrial properties owned | 714
Number of Joint Ventures | 2
Number of joint ventures in which the company disposed of their equity interests | 5
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 properties owned | 63,400,000
2007 Europe Joint Venture [Member] |
Organization and Formation of Company [Line Items] |
Number of industrial properties owned | 0

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
Name: | fr_NumberOfJointVentures
Namespace Prefix: | fr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of joint ventures in which the company disposed of their equity interests. + References No definition available. + Details
Name: | fr_NumberOfJointVenturesInWhichCompanyDisposedOfTheirEquityInterests
Namespace Prefix: | fr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of provinces in Canada in which the entity operates as of the balance sheet date. + References No definition available. + Details
Name: | fr_NumberOfProvincesInWhichEntityOperates
Namespace Prefix: | fr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | fr_OrganizationAndFormationOfCompanyLineItems
Namespace Prefix: | fr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant