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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure        
Pay vs Performance Disclosure, Table
Year
Summary Compensation Table Total for PEOs(1)
Compensation Actually
Paid to PEOs(2)
Average Summary Compen-sation Table Total for Non-PEO NEOs(1)(3)
Average Compen-sation Actually Paid to Non-PEO NEOs(2)
Value of Initial Fixed $100 Investment
Based On:
Net Income(6)
FFO per share – diluted, as adjusted (7)
PEO#1PEO#2PEO#3PEO#1PEO#2PEO#3
ARE TSR
(4)
FTSE Health Care TSR(5)
FTSE Office TSR(5)
2023$15,485,330 $9,869,367 —$12,940,456 $7,260,065 —$7,725,976 $6,862,308 $88.9 $93.0 $63.3 $280,994,000 $8.97 
2022$13,035,517 $9,289,388 $7,231,836 $5,240,793 $1,066,125 $(874,179)$7,931,051 $3,771,122 $97.8 $81.6 $62.1 $670,701,000 $8.42 
2021$12,701,393 $8,274,131 $8,320,228 $20,240,869 $15,720,892 $15,766,043 $7,301,308 $10,927,591 $145.1 $104.9 $99.5 $654,282,000 $7.76 
2020$11,788,493 $8,040,857 $8,089,773 $16,477,994 $11,907,425 $11,957,114 $5,499,035 $7,052,360 $113.3 $90.1 $81.6 $827,171,000 $7.30 
      
Company Selected Measure Name FFO per share – diluted, as adjusted (7)      
Peer Group Issuers, Footnote The peer group used for this purpose is the group of companies included in the FTSE Nareit Equity Health Care Index, which is the industry peer group used in our Annual Report on Form 10-K pursuant to Item 201(e) of Regulation S-K for the fiscal year ended December 31, 2023. We have selected a new peer group that more accurately reflects our core business and strategic emphasis on laboratory and life science properties. The FTSE Nareit Equity Health Care Index, comprising REITs that focus on the ownership, operation, and leasing of healthcare facilities — including hospitals, laboratories, and medical offices — provides a better alignment with our primary business operations than the previously used FTSE Nareit Equity Office Index. By selecting the new index as our peer group, we align our performance evaluation with companies that face similar operational dynamics and are similarly affected by fluctuations in the macroeconomic environment, providing for a more meaningful and equitable comparison. The separate peer group used by the Compensation Committee for purposes of determining compensation paid to our NEOs is described under “Compensation Peer Group” on page 62.      
Adjustment To PEO Compensation, Footnote To calculate compensation actually paid to our PEOs, and the average compensation actually paid to the Non-PEO NEOs, the following adjustments were made to the amounts reported for performance year 2023 in the “Summary Compensation Table” on page 98, in accordance with the requirements of Item 402(v) of Regulation S-K. See the “Pay Versus Performance” section on page 110 of the proxy statement for our 2023 annual meeting of stockholders for the adjustments made to determine compensation actually paid for prior years.
Stock Awards Unvested
at Year-End		Stock Awards Vested During the Covered YearAdd: Dividend Paid on Unvested Stock During Covered Year Add: Pension Plan Service Cost Less Change in Pension ValueCompensation Actually Paid
NameYearTotal
Compensation From Summary Compensation Table		Less: Grant Date Fair Value of Stock Awards From Summary Compensation TableAdd: Year-End Fair Value of Stock Awards Granted in Covered YearAdd: Change in Fair Value From Prior Year-End of Stock Awards Granted in Prior YearsAdd: Grants Made in Covered Year: Fair Value on Vesting DateAdd: Grants Made in Prior Years: Change in Fair Value on Vesting Date Versus Prior Year-End
PEO#12023$15,485,330 $8,089,293 $6,354,216 $(2,211,544)$379,965 $364,238 $657,544 $— $— $12,940,456 
PEO#22023$9,869,367 $7,222,595 $5,519,439 $(2,279,728)$621,855 $263,221 $526,921 $— $(38,415)$7,260,065 
PEO#32023— — — — — — — — — — 
Non-PEO NEOs 2023$7,725,976 $5,613,769 $5,325,824 $(865,337)$— $(65,532)$378,618 $— $(23,472)$6,862,308 
      
Non-PEO NEO Average Total Compensation Amount $ 7,725,976 $ 7,931,051 $ 7,301,308 $ 5,499,035
Non-PEO NEO Average Compensation Actually Paid Amount $ 6,862,308 3,771,122 10,927,591 7,052,360
Adjustment to Non-PEO NEO Compensation Footnote To calculate compensation actually paid to our PEOs, and the average compensation actually paid to the Non-PEO NEOs, the following adjustments were made to the amounts reported for performance year 2023 in the “Summary Compensation Table” on page 98, in accordance with the requirements of Item 402(v) of Regulation S-K. See the “Pay Versus Performance” section on page 110 of the proxy statement for our 2023 annual meeting of stockholders for the adjustments made to determine compensation actually paid for prior years.
Stock Awards Unvested
at Year-End		Stock Awards Vested During the Covered YearAdd: Dividend Paid on Unvested Stock During Covered Year Add: Pension Plan Service Cost Less Change in Pension ValueCompensation Actually Paid
NameYearTotal
Compensation From Summary Compensation Table		Less: Grant Date Fair Value of Stock Awards From Summary Compensation TableAdd: Year-End Fair Value of Stock Awards Granted in Covered YearAdd: Change in Fair Value From Prior Year-End of Stock Awards Granted in Prior YearsAdd: Grants Made in Covered Year: Fair Value on Vesting DateAdd: Grants Made in Prior Years: Change in Fair Value on Vesting Date Versus Prior Year-End
PEO#12023$15,485,330 $8,089,293 $6,354,216 $(2,211,544)$379,965 $364,238 $657,544 $— $— $12,940,456 
PEO#22023$9,869,367 $7,222,595 $5,519,439 $(2,279,728)$621,855 $263,221 $526,921 $— $(38,415)$7,260,065 
PEO#32023— — — — — — — — — — 
Non-PEO NEOs 2023$7,725,976 $5,613,769 $5,325,824 $(865,337)$— $(65,532)$378,618 $— $(23,472)$6,862,308 
      
Compensation Actually Paid vs. Total Shareholder Return PVP TSR.jpg      
Compensation Actually Paid vs. Net Income pvp_netincome.jpg      
Compensation Actually Paid vs. Company Selected Measure pvp_FFO.jpg      
Tabular List, Table Funds from operations per share – diluted, as adjusted
•Funds from operations per share multiple compared to FTSE Nareit Equity Office Index constituents
•Total shareholder return
•Relative TSR compared to FTSE Nareit Equity Office Index constituents
•Adjusted EBITDA margin
•Net debt to Adjusted EBITDA
•Liquidity
      
Total Shareholder Return Amount $ 88.9 97.8 145.1 113.3
Peer Group Total Shareholder Return Amount 93.0 81.6 104.9 90.1
Net Income (Loss) $ 280,994,000 $ 670,701,000 $ 654,282,000 $ 827,171,000
Company Selected Measure Amount 8.97 8.42 7.76 7.30
Additional 402(v) Disclosure Amounts represent the average of the amounts reported for the Company’s Non-PEO NEOs as a group in the “Total” column of the “Summary Compensation Table” on page 98 in each applicable year.TSR is determined based on the value of an initial fixed investment of $100 on December 31, 2019. Cumulative TSR is calculated by dividing the sum of the cumulative amount of dividends for the measurement period, assuming dividend reinvestment, and the difference between the Company’s stock price at the end and the beginning of the measurement period by the Company’s stock price at the beginning of the measurement period.Net income attributable to Alexandria as reported in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023.      
are_PeerGroupTotalShareholderReturnAmountTwo $ 63.3 $ 62.1 $ 99.5 $ 81.6
Measure:: 1        
Pay vs Performance Disclosure        
Name Funds from operations per share – diluted, as adjusted      
Non-GAAP Measure Description As required by Item 402(v) of Regulation S-K, we have determined that funds from operations per share – diluted, as adjusted, is the Company-Selected Measure (as defined in Item 402(v)). Refer to the “Definitions and Reconciliations” section of this Proxy Statement for additional information.      
Measure:: 2        
Pay vs Performance Disclosure        
Name Funds from operations per share multiple compared to FTSE Nareit Equity Office Index constituents      
Measure:: 3        
Pay vs Performance Disclosure        
Name Total shareholder return      
Measure:: 4        
Pay vs Performance Disclosure        
Name Relative TSR compared to FTSE Nareit Equity Office Index constituents      
Measure:: 5        
Pay vs Performance Disclosure        
Name Adjusted EBITDA margin      
Measure:: 6        
Pay vs Performance Disclosure        
Name Net debt to Adjusted EBITDA      
Measure:: 7        
Pay vs Performance Disclosure        
Name Liquidity      
Joel S. Marcus [Member]        
Pay vs Performance Disclosure        
PEO Total Compensation Amount $ 15,485,330 13,035,517 12,701,393 11,788,493
PEO Actually Paid Compensation Amount $ 12,940,456 5,240,793 20,240,869 16,477,994
PEO Name Joel S. Marcus      
Peter M. Moglia [Member]        
Pay vs Performance Disclosure        
PEO Total Compensation Amount $ 9,869,367 9,289,388 8,274,131 8,040,857
PEO Actually Paid Compensation Amount $ 7,260,065 1,066,125 15,720,892 11,907,425
PEO Name Peter M. Moglia      
Stephen A. Richardson [Member]        
Pay vs Performance Disclosure        
PEO Total Compensation Amount $ 0 7,231,836 8,320,228 8,089,773
PEO Actually Paid Compensation Amount $ 0 $ (874,179) $ 15,766,043 $ 11,957,114
PEO Name Stephen A. Richardson      
PEO | Joel S. Marcus [Member] | Stock Awards From Summary Compensation Table [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount $ 8,089,293      
PEO | Joel S. Marcus [Member] | Stock Awards Unvested at Year End, Year-End Fair Value of Awards Granted in Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 6,354,216      
PEO | Joel S. Marcus [Member] | Stock Awards Unvested at Year End, Year-Over-Year Change in Fair Value of Awards Granted in Prior Years [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount (2,211,544)      
PEO | Joel S. Marcus [Member] | Stock Awards Vested During the Covered Year, Grants Made in Covered Year: Fair Value on Vesting Date [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 379,965      
PEO | Joel S. Marcus [Member] | Stock Awards Vested During the Covered Year, Grants Made in Prior Years: Change in Fair Value on Vesting Date Versus Prior Year-End [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 364,238      
PEO | Joel S. Marcus [Member] | Dividend Paid on Unvested Stock During Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 657,544      
PEO | Joel S. Marcus [Member] | Pension Plan Service Cost [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Joel S. Marcus [Member] | Change in Pension Value [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Peter M. Moglia [Member] | Stock Awards From Summary Compensation Table [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 7,222,595      
PEO | Peter M. Moglia [Member] | Stock Awards Unvested at Year End, Year-End Fair Value of Awards Granted in Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 5,519,439      
PEO | Peter M. Moglia [Member] | Stock Awards Unvested at Year End, Year-Over-Year Change in Fair Value of Awards Granted in Prior Years [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount (2,279,728)      
PEO | Peter M. Moglia [Member] | Stock Awards Vested During the Covered Year, Grants Made in Covered Year: Fair Value on Vesting Date [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 621,855      
PEO | Peter M. Moglia [Member] | Stock Awards Vested During the Covered Year, Grants Made in Prior Years: Change in Fair Value on Vesting Date Versus Prior Year-End [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 263,221      
PEO | Peter M. Moglia [Member] | Dividend Paid on Unvested Stock During Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 526,921      
PEO | Peter M. Moglia [Member] | Pension Plan Service Cost [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Peter M. Moglia [Member] | Change in Pension Value [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount (38,415)      
PEO | Stephen A. Richardson [Member] | Stock Awards From Summary Compensation Table [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Stock Awards Unvested at Year End, Year-End Fair Value of Awards Granted in Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Stock Awards Unvested at Year End, Year-Over-Year Change in Fair Value of Awards Granted in Prior Years [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Stock Awards Vested During the Covered Year, Grants Made in Covered Year: Fair Value on Vesting Date [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Stock Awards Vested During the Covered Year, Grants Made in Prior Years: Change in Fair Value on Vesting Date Versus Prior Year-End [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Dividend Paid on Unvested Stock During Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Pension Plan Service Cost [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
PEO | Stephen A. Richardson [Member] | Change in Pension Value [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
Non-PEO NEO | Stock Awards From Summary Compensation Table [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 5,613,769      
Non-PEO NEO | Stock Awards Unvested at Year End, Year-End Fair Value of Awards Granted in Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 5,325,824      
Non-PEO NEO | Stock Awards Unvested at Year End, Year-Over-Year Change in Fair Value of Awards Granted in Prior Years [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount (865,337)      
Non-PEO NEO | Stock Awards Vested During the Covered Year, Grants Made in Covered Year: Fair Value on Vesting Date [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
Non-PEO NEO | Stock Awards Vested During the Covered Year, Grants Made in Prior Years: Change in Fair Value on Vesting Date Versus Prior Year-End [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount (65,532)      
Non-PEO NEO | Dividend Paid on Unvested Stock During Covered Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 378,618      
Non-PEO NEO | Pension Plan Service Cost [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 0      
Non-PEO NEO | Change in Pension Value [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount $ (23,472)