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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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