Real Estate and Accumulated Depreciation (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011
Real Estate And Accumulated Depreciation (Textual) [Abstract]
Aggregate cost for Federal tax purposes	$ 18,400,000,000
Mortgage notes	3,000,000,000
ProLogis American Industrial Fund II	277,000,000
Assessment bonds	743,800,000
Amount secured of mortgage notes	7,100,000,000
Assessment bonds	$ 17,700,000
Capital Improvements [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful lives for real estate assets	7
Capital Improvements [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful lives for real estate assets	5
Standard Tenant Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful lives for real estate assets	10
Acquired Industrial Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful lives for real estate assets	30
Properties Developed [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful lives for real estate assets	40
Land improvements on developed buildings [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful lives for real estate assets	25