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Business Combinations (Details)	3 Months Ended		6 Months Ended
Business Combinations (Details)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 EUR (€)	Jun. 03, 2011 USD ($) sqft	Jun. 03, 2011 EUR (€)	May 25, 2011	Apr. 30, 2011	Dec. 31, 2010
Business Acquisition, Pro Forma Information [Abstract]
Revenue	$ 505,023,000	$ 461,170,000	$ 992,653,000	$ 925,620,000
Net earnings attributable to Common Shares	(59,172,000)	(47,707,000)	(110,512,000)	(169,390,000)
Net earnings per share attributable to Common Shares - Basic	$ (0.13)	$ (0.11)	$ (0.24)	$ (0.41)
Net earnings per share attributable to Common Shares - Diluted	$ (0.13)	$ (0.11)	$ (0.24)	$ (0.41)
Business Acquisition, Purchase Price Allocation [Abstract]
Investment in real estate properties	8,103,700		8,103,700
Investments in unconsolidated investees	1,632,200		1,632,200
Cash, accounts receivable and other assets	736,500		736,500
Debt	(3,646,700)		(3,646,700)
Accounts payable, accrued expenses and other liabilities	(463,600)		(463,600)
Business Acquisition Purchase Price Allocation Minority Interest	(505,600)		(505,600)
Business Acquisition Purchase Price Allocation Stock Awards	(62,400)		(62,400)
Business Combination, Consideration Transferred [Abstract]
Common stock, shares outstanding	458,872,000		458,872,000							254,482,000
Total shares of the combined company (for accounting purposes)	952,300,000		952,300,000
Number of AMB shares to be issued (assumed to be 40% of total shares of the combined company)			380,900,000
Estimated Aggregate Consideration	5,794,100,000		5,794,100,000
Business Combinations Textuals [Abstract]
Count of Units Purchased									11,100,000
Ordinary Unit Additional Unit Purchase								96,500,000
Acquisition of Convertible Preferred Units								2,700,000
Aggregate Cash Purchased	1,000,000,000		1,000,000,000		715,800,000
Global Line Debt Borrowings					500,000,000
Mark To Market Valuation of Carrying Value of Equity					486,000,000
Valuation Gain From Investment	85,900,000		85,900,000		59,600,000
Preliminary Aggregate Purchase Price						1,600,000,000	1,100,000,000
Count Of Countries With Buildings Acquired						53,000,000	53,000,000
Rental Income Included in Pro Forma Results	84,700,000		84,700,000
Rental Expenses Included In Pro Forma Results	$ 19,600,000		$ 19,600,000