Basis of presentation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Real Estate Properties
Number of operating properties	171		171
Basis of presentation
Percentage of ownership interest criteria	100.00%		100.00%
Unrealized gain on marketable securities	$ 6,169		$ 6,169		$ 6,157
Unrealized loss on interest rate hedge agreements	(39,321)		(39,321)		(44,807)
Unrealized gain on foreign currency translation	26,880		26,880		20,315
Total	(6,272)		(6,272)		(18,335)
Net income (loss)	34,311	(12,224)	66,936	16,561
Unrealized (loss) gain on marketable securities	(501)	(2,190)	12	(1,853)
Unrealized (loss) gain on interest rate hedge agreements	(253)	(3,188)	5,486	(2,081)
Unrealized gain (loss) on foreign currency translation	1,676	(8,004)	6,559	(2,629)
Comprehensive income (loss)	35,233	(25,606)	78,993	9,998
Comprehensive income attributable to noncontrolling interests	939	935	1,861	1,949
Comprehensive income (loss) attributable to Alexandria Real Estate Equities, Inc.	$ 34,294	$ (26,541)	$ 77,132	$ 8,049
Minimum percentage of taxable income to be distributed (as a percent)			90.00%
The Company generally distributes this percentage or more of its taxable income (as a percent)			100.00%
The "more likely than not" probability threshold (as a percent)			50.00%
Canada
Real Estate Properties
Number of operating properties	4		4
Number of development parcels	1		1

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