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Detail of secured and unsecured senior debt (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jul. 31, 2023 | Jun. 30, 2023 | Feb. 28, 2023
Debt Instrument [Line Items] |  |  |  |  |
Effective rate (as a percent) | 3.72% |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 32 |  |  |  |
2025 | 600,034 |  |  |  |
2026 | 769,710 |  |  |  |
2027 | 350,038 |  |  |  |
2028 | 525,041 |  |  |  |
Thereafter | 9,150,438 |  |  |  |
Outstanding Balance | 11,395,293 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (79,651) |  |  |  |
Total Consolidated | $ 11,315,642 |  |  |  |
Alexandria | 99 Coolidge Avenue |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 75.00% |  |  |  |
Secured notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective rate (as a percent) | 8.37% |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 32 |  |  |  |
2025 | 34 |  |  |  |
2026 | 119,710 |  |  |  |
2027 | 38 |  |  |  |
2028 | 41 |  |  |  |
Thereafter | 438 |  |  |  |
Outstanding Balance | 120,293 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (631) |  |  |  |
Total Consolidated | $ 119,662 |  |  |  |
Secured notes payable maturing on 11/19/26 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective rate (as a percent) | 8.38% |  |  |  |
Maturity date | Nov. 19, 2026 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 119,674 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 119,674 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (631) |  |  |  |
Total Consolidated | 119,043 |  |  |  |
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, borrowing capacity | $ 75,600 |  |  |  |
Secured notes payable maturing on 7/1/36 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 6.50% |  |  |  |
Effective rate (as a percent) | 6.50% |  |  |  |
Maturity date | Jul. 01, 2036 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 32 |  |  |  |
2025 | 34 |  |  |  |
2026 | 36 |  |  |  |
2027 | 38 |  |  |  |
2028 | 41 |  |  |  |
Thereafter | 438 |  |  |  |
Outstanding Balance | 619 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0 |  |  |  |
Total Consolidated | $ 619 |  |  |  |
Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective rate (as a percent) | 3.67% |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 600,000 |  |  |  |
2026 | 650,000 |  |  |  |
2027 | 350,000 |  |  |  |
2028 | 525,000 |  |  |  |
Thereafter | 9,150,000 |  |  |  |
Outstanding Balance | 11,275,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (79,020) |  |  |  |
Total Consolidated | 11,195,980 |  |  |  |
Unsecured senior line of credit |  |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
Total Consolidated | $ 0 |  |  |  |
3.45% unsecured senior notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.45% |  |  |  |
Effective rate (as a percent) | 3.62% |  |  |  |
Maturity date | Apr. 30, 2025 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 600,000 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 600,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (1,181) |  |  |  |
Total Consolidated | $ 598,819 |  |  |  |
4.30% unsecured senior notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.30% |  |  |  |
Effective rate (as a percent) | 4.50% |  |  |  |
Maturity date | Jan. 15, 2026 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 300,000 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 300,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (1,022) |  |  |  |
Total Consolidated | $ 298,978 |  |  |  |
3.80% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.80% |  |  |  |
Effective rate (as a percent) | 3.96% |  |  |  |
Maturity date | Apr. 15, 2026 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 350,000 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 350,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (1,143) |  |  |  |
Total Consolidated | $ 348,857 |  |  |  |
3.95% unsecured senior notes payable due in 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.95% |  |  |  |
Effective rate (as a percent) | 4.13% |  |  |  |
Maturity date | Jan. 15, 2027 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 350,000 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 350,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (1,574) |  |  |  |
Total Consolidated | $ 348,426 |  |  |  |
3.95% unsecured senior notes payable due in 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.95% |  |  |  |
Effective rate (as a percent) | 4.07% |  |  |  |
Maturity date | Jan. 15, 2028 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 425,000 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 425,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (1,733) |  |  |  |
Total Consolidated | $ 423,267 |  |  |  |
4.50% unsecured senior notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.50% |  |  |  |
Effective rate (as a percent) | 4.60% |  |  |  |
Maturity date | Jul. 30, 2029 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 300,000 |  |  |  |
Outstanding Balance | 300,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (1,248) |  |  |  |
Total Consolidated | $ 298,752 |  |  |  |
2.75% Unsecured Senior Notes Payable Due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 2.75% |  |  |  |
Effective rate (as a percent) | 2.87% |  |  |  |
Maturity date | Dec. 15, 2029 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 400,000 |  |  |  |
Outstanding Balance | 400,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (2,473) |  |  |  |
Total Consolidated | $ 397,527 |  |  |  |
4.70% unsecured senior note payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.70% |  |  |  |
Effective rate (as a percent) | 4.81% |  |  |  |
Maturity date | Jul. 01, 2030 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 450,000 |  |  |  |
Outstanding Balance | 450,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (2,425) |  |  |  |
Total Consolidated | $ 447,575 |  |  |  |
4.90% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.90% |  |  |  |
Effective rate (as a percent) | 5.05% |  |  |  |
Maturity date | Dec. 15, 2030 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 700,000 |  |  |  |
Outstanding Balance | 700,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (5,511) |  |  |  |
Total Consolidated | $ 694,489 |  |  |  |
3.375% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.375% |  |  |  |
Effective rate (as a percent) | 3.48% |  |  |  |
Maturity date | Aug. 15, 2031 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 750,000 |  |  |  |
Outstanding Balance | 750,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (4,990) |  |  |  |
Total Consolidated | $ 745,010 |  |  |  |
2.00% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 2.00% |  |  |  |
Effective rate (as a percent) | 2.12% |  |  |  |
Maturity date | May 18, 2032 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 900,000 |  |  |  |
Outstanding Balance | 900,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (7,887) |  |  |  |
Total Consolidated | $ 892,113 |  |  |  |
1.875% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 1.875% |  |  |  |
Effective rate (as a percent) | 1.97% |  |  |  |
Maturity date | Feb. 01, 2033 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 1,000,000 |  |  |  |
Outstanding Balance | 1,000,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (7,976) |  |  |  |
Total Consolidated | $ 992,024 |  |  |  |
2.95% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 2.95% |  |  |  |
Effective rate (as a percent) | 3.07% |  |  |  |
Maturity date | Mar. 15, 2034 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 800,000 |  |  |  |
Outstanding Balance | 800,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (7,989) |  |  |  |
Total Consolidated | $ 792,011 |  |  |  |
4.75% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.75% |  |  |  | 4.75%
Effective rate (as a percent) | 4.88% |  |  |  |
Maturity date | Apr. 15, 2035 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 500,000 |  |  |  |
Outstanding Balance | 500,000 |  |  |  | $ 500,000
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (5,411) |  |  |  |
Total Consolidated | $ 494,589 |  |  |  |
4.85% Unsecured Senior Note Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.85% |  |  |  |
Effective rate (as a percent) | 4.93% |  |  |  |
Maturity date | Apr. 15, 2049 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 300,000 |  |  |  |
Outstanding Balance | 300,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (2,987) |  |  |  |
Total Consolidated | $ 297,013 |  |  |  |
4.00% Unsecured Senior Notes Payables Due 2050 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 4.00% |  |  |  |
Effective rate (as a percent) | 3.91% |  |  |  |
Maturity date | Feb. 01, 2050 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 700,000 |  |  |  |
Outstanding Balance | 700,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | 10,111 |  |  |  |
Total Consolidated | $ 710,111 |  |  |  |
3.00% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.00% |  |  |  |
Effective rate (as a percent) | 3.08% |  |  |  |
Maturity date | May 18, 2051 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 850,000 |  |  |  |
Outstanding Balance | 850,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (11,608) |  |  |  |
Total Consolidated | $ 838,392 |  |  |  |
3.55% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 3.55% |  |  |  |
Effective rate (as a percent) | 3.63% |  |  |  |
Maturity date | Mar. 15, 2052 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 1,000,000 |  |  |  |
Outstanding Balance | 1,000,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (14,112) |  |  |  |
Total Consolidated | $ 985,888 |  |  |  |
5.15% Unsecured Senior Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percent) | 5.15% |  |  |  | 5.15%
Effective rate (as a percent) | 5.26% |  |  |  |
Maturity date | Apr. 15, 2053 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2024 | $ 0 |  |  |  |
2025 | 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 0 |  |  |  |
Thereafter | 500,000 |  |  |  |
Outstanding Balance | 500,000 |  |  |  | $ 500,000
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (7,813) |  |  |  |
Total Consolidated | 492,187 |  |  |  |
Commercial paper program |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commercial paper, maximum issuance |  |  | $ 2,500,000 | $ 2,000,000 |
Future principal payments due on secured and unsecured debt |  |  |  |  |
Outstanding Balance | $ 100,000 |  |  |  |
Commercial paper program | Unsecured senior line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective rate (as a percent) | 5.76% |  |  |  |
Maturity date | Jan. 22, 2028 |  |  |  |
Future principal payments due on secured and unsecured debt |  |  |  |  |
2025 | $ 0 |  |  |  |
2026 | 0 |  |  |  |
2027 | 0 |  |  |  |
2028 | 100,000 |  |  |  |
Thereafter | 0 |  |  |  |
Outstanding Balance | 100,000 |  |  |  |
Unamortized Discount (Premium) and Debt Issuance Costs, Net | (48) |  |  |  |
Total Consolidated | $ 99,952 |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Secured notes payable maturing on 11/19/26 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Applicable margin (as a percent) | 2.70% |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Unsecured senior line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Applicable margin (as a percent) | 0.835% | 0.875% |  |  |

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