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Organization and basis of presentation (Details) ft² in Millions, $ in Billions | 9 Months Ended
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Sep. 30, 2023 USD ($) ft² property
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of Tenants | property | 800
Market capitalization | $ | $ 28.3
Area of real estate property | ft² | 75.1

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- Definition Market Capitalization + References No definition available. + Details
Name: | are_MarketCapitalization
Namespace Prefix: | are_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the number of tenants. + References No definition available. + Details
Name: | are_NumberOfTenants
Namespace Prefix: | are_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration