Excess Amount of Disposal Group Consideration, After Repayment of Debt

No definition available.

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- Definition

Number Of Retail Properties Held-For-Sale

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

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- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

Name:	dei_LegalEntityAxis=ahh_OperatingPartnershipMember
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- Details

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Real Estate Investment Real Estate Investment - Property Disposition (Details) $ in Thousands			9 Months Ended
	Sep. 01, 2020 USD ($)	May 29, 2020 USD ($) property	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Real Estate Properties [Line Items]
Dispositions of real estate investments, net of selling costs			$ 96,458	$ 32,468
Disposed of by Sale
Real Estate Properties [Line Items]
Number of retail properties held-for-sale \| property		7
Real estate held-for-sale		$ 90,000
Gain (loss) on disposition of property		2,800
Revolving Credit Facility \| New Credit Facility \| Operating Partnership
Real Estate Properties [Line Items]
Repayments of long-term lines of credit		61,900
Proceeds from disposal group consideration after payments to long-term lines of credit		$ 25,900
Hanbury Village \| Disposed of by Sale
Real Estate Properties [Line Items]
Gain (loss) on disposition of property	$ 3,600
Dispositions of real estate investments, net of selling costs	$ 7,000