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Detail of secured and unsecured senior debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 29, 2024
Jul. 31, 2023
Debt Instrument [Line Items]        
Effective rate (as a percent) 3.86%      
Future principal payments due on secured and unsecured debt        
2025 $ 600,034      
2026 799,630      
2027 350,038      
2028 425,041      
2029 700,044      
Thereafter 9,450,394      
Outstanding Balance 12,325,181      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (80,807)      
Total Consolidated $ 12,244,374      
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) 7.51%      
Future principal payments due on secured and unsecured debt        
2025 $ 34      
2026 149,630      
2027 38      
2028 41      
2029 44      
Thereafter 394      
Outstanding Balance 150,181      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (272)      
Total Consolidated $ 149,909      
Secured notes payable maturing on 11/19/26        
Debt Instrument [Line Items]        
Applicable margin (as a percent) 2.70%      
Effective rate (as a percent) 7.52%      
Maturity date Nov. 19, 2026      
Future principal payments due on secured and unsecured debt        
2025 $ 0      
2026 149,594      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Outstanding Balance 149,594      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (272)      
Total Consolidated 149,322      
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue        
Debt Instrument [Line Items]        
Debt instrument, borrowing capacity $ 45,700      
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        
2025 $ 34      
2026 36      
2027 38      
2028 41      
2029 44      
Thereafter 394      
Outstanding Balance 587      
Unamortized Discount (Premium) and Debt Issuance Costs, Net 0      
Total Consolidated $ 587      
Unsecured Debt        
Debt Instrument [Line Items]        
Effective rate (as a percent) 3.81%      
Future principal payments due on secured and unsecured debt        
2025 $ 600,000      
2026 650,000      
2027 350,000      
2028 425,000      
2029 700,000      
Thereafter 9,450,000      
Outstanding Balance 12,175,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (80,535)      
Total Consolidated $ 12,094,465      
Unsecured senior line of credit        
Debt Instrument [Line Items]        
Applicable margin (as a percent) 0.855% 0.875%    
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        
2025 $ 600,000      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Outstanding Balance 600,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (296)      
Total Consolidated $ 599,704      
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        
2025 $ 0      
2026 300,000      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Outstanding Balance 300,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (532)      
Total Consolidated $ 299,468      
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        
2025 $ 0      
2026 350,000      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Outstanding Balance 350,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (653)      
Total Consolidated $ 349,347      
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        
2025 $ 0      
2026 0      
2027 350,000      
2028 0      
2029 0      
Thereafter 0      
Outstanding Balance 350,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (1,067)      
Total Consolidated $ 348,933      
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        
2025 $ 0      
2026 0      
2027 0      
2028 425,000      
2029 0      
Thereafter 0      
Outstanding Balance 425,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (1,312)      
Total Consolidated $ 423,688      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 300,000      
Thereafter 0      
Outstanding Balance 300,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (1,027)      
Total Consolidated $ 298,973      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 400,000      
Thereafter 0      
Outstanding Balance 400,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (2,064)      
Total Consolidated $ 397,936      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 450,000      
Outstanding Balance 450,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (2,057)      
Total Consolidated $ 447,943      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 700,000      
Outstanding Balance 700,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (4,730)      
Total Consolidated $ 695,270      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 750,000      
Outstanding Balance 750,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (4,348)      
Total Consolidated $ 745,652      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 900,000      
Outstanding Balance 900,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (6,967)      
Total Consolidated $ 893,033      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 1,000,000      
Outstanding Balance 1,000,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (7,109)      
Total Consolidated $ 992,891      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 800,000      
Outstanding Balance 800,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (7,236)      
Total Consolidated $ 792,764      
4.75% Unsecured Senior Notes Payable        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 4.75%      
Effective rate (as a percent) 4.88%      
Maturity date Apr. 15, 2035      
Future principal payments due on secured and unsecured debt        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 500,000      
Outstanding Balance 500,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (4,958)      
Total Consolidated $ 495,042      
5.25% Unsecured Senior Notes Payable        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 5.25%   5.25%  
Effective rate (as a percent) 5.38%      
Maturity date May 15, 2036      
Future principal payments due on secured and unsecured debt        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 400,000      
Outstanding Balance 400,000   $ 400,000  
Unamortized Discount (Premium) and Debt Issuance Costs, Net (4,109)      
Total Consolidated $ 395,891      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 300,000      
Outstanding Balance 300,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (2,872)      
Total Consolidated $ 297,128      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 700,000      
Outstanding Balance 700,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net 9,985      
Total Consolidated $ 709,985      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 850,000      
Outstanding Balance 850,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (11,227)      
Total Consolidated $ 838,773      
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        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 1,000,000      
Outstanding Balance 1,000,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (13,673)      
Total Consolidated $ 986,327      
5.15% Unsecured Senior Notes Payable        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 5.15%      
Effective rate (as a percent) 5.26%      
Maturity date Apr. 15, 2053      
Future principal payments due on secured and unsecured debt        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 500,000      
Outstanding Balance 500,000      
Unamortized Discount (Premium) and Debt Issuance Costs, Net (7,592)      
Total Consolidated $ 492,408      
5.625% Unsecured Senior Notes Payable        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 5.625%   5.625%  
Effective rate (as a percent) 5.71%      
Maturity date May 15, 2054      
Future principal payments due on secured and unsecured debt        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 600,000      
Outstanding Balance 600,000   $ 600,000  
Unamortized Discount (Premium) and Debt Issuance Costs, Net (6,691)      
Total Consolidated 593,309      
Commercial paper program        
Debt Instrument [Line Items]        
Commercial paper, maximum issuance       $ 2,500,000
Future principal payments due on secured and unsecured debt        
Outstanding Balance $ 0      
Commercial paper program | Unsecured senior line of credit        
Debt Instrument [Line Items]        
Maturity date Jan. 22, 2030      
Future principal payments due on secured and unsecured debt        
2025 $ 0      
2026 0      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Outstanding Balance 0      
Unamortized Discount (Premium) and Debt Issuance Costs, Net 0      
Total Consolidated $ 0