Organization and Formation of Company - Additional Information (Detail)	12 Months Ended
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

The number of joint ventures that the entity owns a non-controlling interest in as of the balance sheet date.

No definition available.

Number of joint ventures in which the company disposed of their equity interests.

No definition available.

Name:	fr_NumberOfJointVenturesInWhichCompanyDisposedOfTheirEquityInterests
Namespace Prefix:	fr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of provinces in Canada in which the entity operates as of the balance sheet date.

No definition available.

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

Name:	fr_OrganizationAndFormationOfCompanyLineItems
Namespace Prefix:	fr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

The number of real estate properties owned as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant