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Investments in real estate - Real estate asset sales (Details) $ in Thousands		3 Months Ended			12 Months Ended
	Jan. 10, 2020 ft² property	Dec. 31, 2023 USD ($) ft² property	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) ft² property	Dec. 31, 2023 USD ($) ft² property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		73,500,000			73,500,000
Proceeds from Noncontrolling Interests					$ 547,391	$ 1,542,347	$ 2,026,486
Contributions from and sales of noncontrolling interests					542,589	1,560,129	2,147,061
Proceeds from sales of real estate					1,195,743	994,331	190,576
Gain on sales of real estate					277,037	537,918	126,570
Impairment of real estate					461,114	64,969	52,675
Noncontrolling Interests
Real Estate Properties [Line Items]
Contributions from and sales of noncontrolling interests					$ 508,693	910,506	1,157,668
Number of real estate properties | property		68			68
Additional Paid-In Capital
Real Estate Properties [Line Items]
Contributions from and sales of noncontrolling interests					$ 33,896	$ 649,623	$ 989,393
15 Necco Street
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²				345,996
Proceeds from Noncontrolling Interests				$ 66,108
15 Necco Street | Additional Paid-In Capital
Real Estate Properties [Line Items]
Contributions from and sales of noncontrolling interests				$ (7,761)
9625 Towne Centre Drive
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²				163,648
Proceeds from Noncontrolling Interests				$ 32,261
9625 Towne Centre Drive | Additional Paid-In Capital
Real Estate Properties [Line Items]
Contributions from and sales of noncontrolling interests				$ 15,553
9625 Towne Centre Drive and 15 Necco Street
Real Estate Properties [Line Items]
Proceeds from Noncontrolling Interests					98,369
9625 Towne Centre Drive and 15 Necco Street | Additional Paid-In Capital
Real Estate Properties [Line Items]
Contributions from and sales of noncontrolling interests					$ 7,792
11119 North Torrey Pines Road
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold				100.00%
Area of Real Estate Property | ft²				72,506
Proceeds from sales of real estate				$ 86,000
Gain on sales of real estate				$ 27,585
780 and 790 Memorial Drive and 225, 231, 266, and 275 Second Avenue
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold				100.00%
Area of Real Estate Property | ft²				428,663
Proceeds from sales of real estate				$ 365,226
Gain on sales of real estate				$ 187,225
640 Memorial Drive, 100 Beaver Street, and 11025 and 11035 Roselle Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold		100.00%			100.00%
Area of Real Estate Property | ft²		361,102			361,102
Proceeds from sales of real estate		$ 312,244
Gain on sales of real estate		$ 59,653
380 and 420 E Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold		100.00%			100.00%
Area of Real Estate Property | ft²		195,506			195,506
Proceeds from sales of real estate		$ 86,969
Impairment of real estate		$ 94,800
275 Grove Street
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold				100.00%
Area of Real Estate Property | ft²	509,702			509,702
Proceeds from sales of real estate				$ 109,349
Impairment of real estate				$ 145,400
Number of real estate properties | property	3
Weighted average remaining lease term	6 years 1 month 6 days
421 Park Drive Condominium
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		268,023			268,023
Proceeds from sales of real estate			$ 174,412
Other
Real Estate Properties [Line Items]
Proceeds from sales of real estate					$ 81,845
Gain on sales of real estate					$ 2,574
421 Park Drive
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		660,034			660,034
421 Park Drive Remaining
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		392,011			392,011
420 E Street
Real Estate Properties [Line Items]
Number of real estate properties | property		1			1
380 E Street
Real Estate Properties [Line Items]
Number of real estate properties | property		1			1
219 East 42nd Street
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		349,947			349,947
Impairment of real estate		$ 93,500
99 A Street
Real Estate Properties [Line Items]
Impairment of real estate		$ 36,100
21540 30th Drive Southeast
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		143,943			143,943
Impairment of real estate		$ 29,700
Number of real estate properties | property		1			1
Greater Boston and Texas
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		230,704			230,704
Impairment of real estate					$ 20,800
Number of real estate properties | property		3			3
Other - Greater Boston
Real Estate Properties [Line Items]
Number of real estate properties | property		1			1
Alexandria | 15 Necco Street | Noncontrolling Interests
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold				18.00%
Alexandria | 9625 Towne Centre Drive | Noncontrolling Interests
Real Estate Properties [Line Items]
Real Estate Property, Ownership Interest Sold				20.10%
North America
Real Estate Properties [Line Items]
Area of Real Estate Property | ft²		42,000,000			42,000,000
Proceeds from sales of real estate					$ 1,216,045
Proceeds from sale of real estate assets and partial interest					$ 1,314,414
Number of real estate properties | property		411			411
China
Real Estate Properties [Line Items]
Impairment of real estate				$ 17,100
Number of real estate properties | property				1

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