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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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