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Investments in Joint Ventures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 sqft Property	Sep. 30, 2011	Sep. 30, 2012 sqft Property	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 2007 Europe Joint Venture [Member] Property	Sep. 30, 2012 2003 Net Lease Joint Venture [Member] Property sqft	Feb. 13, 2012 2003 Net Lease Joint Venture [Member] Property	May 26, 2011 2003 Net Lease Joint Venture [Member] Property
Schedule of Equity Method Investments [Line Items]
Equity Interest Acquired								85.00%	85.00%
Number of industrial properties owned	716		716			0	6	1	1
Gross Leasable Area (GLA) of industrial properties owned	62,700,000		62,700,000				3,100,000
Investment in 2003 Net Lease Joint Venture	$ 1,247		$ 1,247		$ 1,674		$ 1,247
Equity interest						10.00%
Receivables from joint ventures	24		24		137
Fees received from joint ventures	$ 295	$ 113	$ 439	$ 700

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Area of a real estate property.

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For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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