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Period Type:	instant

No definition available.

Name:	ahh_AcquiredLeaseAmortizationExpenseDepreciationAndAmortizationNextYearFive
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

Name:	ahh_AcquiredLeaseAmortizationExpenseDepreciationAndAmortizationNextYearFour
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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No definition available.

Name:	ahh_AcquiredLeaseAmortizationExpenseDepreciationAndAmortizationNextYearThree
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

Name:	ahh_AcquiredLeaseAmortizationExpenseDepreciationAndAmortizationNextYearTwo
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Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for leases with a finite life acquired as part of a real property acquisition included in rental expense expected to be recognized during the next fiscal year following the latest fiscal year.

No definition available.

Name:	ahh_AcquiredLeaseAmortizationRentalExpenseNextTwelveMonths
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for leases with a finite life acquired as part of a real property acquisition included in rental expense expected to be recognized during the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	ahh_AcquiredLeaseAmortizationRentalExpenseYearFive
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Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for leases with a finite life acquired as part of a real property acquisition included in rental expense expected to be recognized during the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	ahh_AcquiredLeaseAmortizationRentalExpenseYearFour
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Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for leases with a finite life acquired as part of a real property acquisition included in rental expense expected to be recognized during the third fiscal year following the latest fiscal year.

No definition available.

Name:	ahh_AcquiredLeaseAmortizationRentalExpenseYearThree
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Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for leases with a finite life acquired as part of a real property acquisition included in rental expense expected to be recognized during the second fiscal year following the latest fiscal year.

No definition available.

Name:	ahh_AcquiredLeaseAmortizationRentalExpenseYearTwo
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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

Name:	ahh_AcquiredLeaseNetAmortizationExpenseFiscalYearMaturityAbstract
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Data Type:	xbrli:stringItemType
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- References

No definition available.

Name:	ahh_AcquiredLeaseNetAmortizationRentalExpenseFiscalYearMaturityAbstract
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Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.