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Investments in Joint Ventures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2012 Property sqft	Dec. 31, 2011 Property	Dec. 31, 2010 Property	May 26, 2012 2003 Net Lease Joint Venture [Member] Property	Feb. 13, 2012 2003 Net Lease Joint Venture [Member] Property	Dec. 31, 2012 2003 Net Lease Joint Venture [Member] Property sqft	Dec. 31, 2011 2003 Net Lease Joint Venture [Member] Property	May 26, 2011 2003 Net Lease Joint Venture [Member]	Dec. 31, 2012 2007 Europe Joint Venture [Member] Property	Dec. 31, 2012 2006 Net Lease Co-Investment Program [Member]	Mar. 21, 2006 2006 Net Lease Co-Investment Program [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest						15.00%			10.00%		15.00%
Industrial properties owned	714					5			0
Gross leasable area (GLA) of industrial properties owned	63,400,000					2,700,000
Investment in Joint Venture	$ 1,012	$ 1,674				$ 1,012
Equity Interest Acquired					85.00%	85.00%	85.00%	85.00%
Number of industrial properties acquired	1	1	3	1	1	1	1
Proceeds from sale of joint venture			5,000							4,541
Gain on Sale of Joint Venture Interests			11,226							852
Receivables from joint ventures	19	137
Fees received from joint ventures	$ 516	$ 970	$ 4,952

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Equity interest acquired.

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Area of a real estate property.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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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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