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v3.21.1

Business of Organization - Additional Information (Details) - property | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Business And Organization [Line Items] |  |
Percentage of operating partnership held | 74.20% | 73.90%
Operating Property |  |
Business And Organization [Line Items] |  |
Number of real estate properties | 55 |
Development Property |  |
Business And Organization [Line Items] |  |
Number of real estate properties | 4 |
General Partner |  |
Business And Organization [Line Items] |  |
Percentage of operating partnership held | 0.10% |

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- Definition Line items for business and organization. + References No definition available. + Details
Name: | ahh_BusinessAndOrganizationLineItems
Namespace Prefix: | ahh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of ownership interests in operating partnership. + References No definition available. + Details
Name: | ahh_PercentageOfOwnershipInterestsInOperatingPartnership
Namespace Prefix: | ahh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=ahh_OperatingPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=ahh_DevelopmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_GeneralPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |