Organization and Formation of Partnership (Details Textual) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Province State JointVentures IndustrialProperty sqft	Dec. 31, 2011
Organization and Formation of Company (Textual) [Abstract]
Number of industrial properties owned	667
Gross Leasable Area (GLA) of industrial properties owned	58,300,000
Organization and Formation of Company (Additional Textual) [Abstract]
Ownership interest of sole general partner	94.70%
General Partner Preferred Units Liquidation Preference	$ 275,000	$ 275,000
Ownership interest of limited partners	5.30%
Number of Joint Ventures	2
Number of states in which industrial properties are located	25
Number of provinces in which industrial properties are located	1
Other Real Estate Partnership [Member]
Organization and Formation of Company (Textual) [Abstract]
Number of industrial properties owned	67
Gross Leasable Area (GLA) of industrial properties owned	7,600,000
Number of limited partnerships	8
Minimum ownership interest in limited partnerships	99.00%
Minimum ownership interest of limited partnerships	0.01%
2007 Europe Joint Venture [Member]
Organization and Formation of Company (Textual) [Abstract]
Number of industrial properties owned	0