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Investments in real estate - Real estate asset sales (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($) ft² property	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) ft² property	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)
Real Estate Properties [Line Items]
Proceeds from sales of real estate			$ 1,220,206	$ 1,195,743	$ 994,331
Gain on sales of real estate			129,312	277,037	537,918
Impairment of real estate		$ 30,800	223,068	$ 461,114	64,969
Potential Asset Acquisition, Area of Real Estate | ft²				1,400,000
Potential Asset Acquisition, Consideration		$ 366,800
Purchase Price			248,699	$ 265,750	$ 2,877,861
Notes Receivable
Real Estate Properties [Line Items]
Financing Receivable, before Allowance for Credit Loss, Noncurrent	$ 103,427		$ 103,427
1401/1413 Research Boulevard
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	84,837		84,837
Proceeds from sales of real estate			$ 22,913
Gain on sales of real estate			$ 3,328
Equity interest percentage (in percent)	65.00%		65.00%
Noncontrolling Interests
Real Estate Properties [Line Items]
Number of real estate properties | property	67		67
4755 and 4757 Nexus Center Drive and 4796 Executive Drive
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	177,804		177,804
Proceeds from sales of real estate			$ 120,000
Gain on sales of real estate			$ 47,511
14225 Newbrook Drive
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	248,186		248,186
Proceeds from sales of real estate			$ 80,500
Gain on sales of real estate			$ 37,074
1165 Eastlake Avenue East
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	100,086		100,086
Proceeds from sales of real estate			$ 149,985
Gain on sales of real estate			$ 21,535
9444 Waples Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	149,000		149,000
Proceeds from sales of real estate			$ 31,000
Gain on sales of real estate			$ 8,175
6040 George Watts Hill Drive
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	149,585		149,585
Proceeds from sales of real estate			$ 93,500
Gain on sales of real estate			$ 5,004
100 Minuteman Road
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	308,970		308,970
Proceeds from sales of real estate			$ 67,300
Gain on sales of real estate			$ 4,042
849/863 Mitten Road/866 Malcolm Road
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	103,857		103,857
Proceeds from sales of real estate			$ 24,000
99 A Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	235,000		235,000
Proceeds from sales of real estate			$ 13,350
219 East 42nd Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	349,947		349,947
Proceeds from sales of real estate			$ 60,000
6101 Quadrangle Drive
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	31,600		31,600
Proceeds from sales of real estate			$ 11,310
Other markets
Real Estate Properties [Line Items]
Proceeds from sales of real estate			38,617
Gain on sales of real estate			$ 5,971
One Moderna Way
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	722,130		722,130
Proceeds from sales of real estate			$ 369,439
Impairment of real estate			$ 40,900
Number of real estate properties | property	4		4
215 First Street, 150 Second Street, and 11 Hurley Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	552,513		552,513
Proceeds from sales of real estate			$ 245,539
Impairment of real estate			$ 6,300
Number of real estate properties | property	3		3
10048 and 10219 Meanley Drive and 10277 Scripps Ranch Boulevard
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold	100.00%		100.00%
Area of Real Estate Property | ft²	444,041		444,041
Proceeds from sales of real estate			$ 55,000
10048 and 10219 Meanley Drive and 10277 Scripps Ranch Boulevard | Notes Receivable
Real Estate Properties [Line Items]
Financing Receivable, before Allowance for Credit Loss, Noncurrent	$ 25,000		25,000
Costa Verde and Scripps Science Park
Real Estate Properties [Line Items]
Impairment of real estate			$ 65,900
Number of real estate properties | property	5		5
Costa Verde and Scripps Science Park | Operating property
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	203,223		203,223
Costa Verde and Scripps Science Park | Future development
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	1,500,000		1,500,000
Alexandria Center for Life Science - New York City
Real Estate Properties [Line Items]
Gross investments in real estate	$ 168,400		$ 168,400
Sorrento Mesa Held For Sale Properties
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	102,392		102,392
Number of real estate properties | property	2		2
830 4th Avenue South
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	45,615		45,615
Impairment of real estate			$ 13,700
Potential Asset Disposition, Consideration	$ 8,000
University Town Center Portfolio Sale
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	100,831		100,831
Impairment of real estate			$ 36,900
Number of real estate properties | property	3		3
Potential Asset Disposition, Consideration			$ 200,000
University Town Center Portfolio Sale | Future development
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	1,000,000		1,000,000
Alexandria | 9444 Waples Street
Real Estate Properties [Line Items]
Proceeds from sales of real estate			$ 15,500
Gain on sales of real estate			$ 3,200
North America
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	39,800,000		39,800,000
Proceeds from sales of real estate			$ 1,359,540
Gain on sales of real estate			$ 129,312
Number of real estate properties | property	391		391
Purchase Price			$ 249,411
Gross investments in real estate	$ 37,214,474		$ 37,214,474	$ 36,344,543
North America | Future development
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	1,040,000		1,040,000
Canada
Real Estate Properties [Line Items]
Number of real estate properties | property	11		11
TEXAS
Real Estate Properties [Line Items]
Impairment of real estate			$ 6,100
Potential Asset Disposition, Consideration	$ 70,000
TEXAS | Future development
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²	1,400,000		1,400,000

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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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