Financing Receivable, Additional Borrowings, Interest Rate, Stated Percentage

No definition available.

Name:	ahh_FinancingReceivableAdditionalBorrowingsInterestRateStatedPercentage
Namespace Prefix:	ahh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Financing Receivable, Discount

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableDiscount
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financing Receivable, Guarantee Premium

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableGuaranteePremium
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Interest Rate, Stated Percentage

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableInterestRateStatedPercentage
Namespace Prefix:	ahh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum amount available to the borrower under the loan commitment.

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableMaximumCommitment
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financing Receivable, Maximum Commitment, Additional Borrowings

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableMaximumCommitmentAdditionalBorrowings
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest Income, Exit Fees

+ References

No definition available.

+ Details

Name:	ahh_InterestIncomeExitFees
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Loan Modification Fee

+ References

No definition available.

+ Details

Name:	ahh_LoanModificationFee
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Notes Receivable, Prepayment Premium Received

+ References

No definition available.

+ Details

Name:	ahh_NotesReceivablePrepaymentPremiumReceived
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

+ Details

Name:	us-gaap_InterestIncomeExpenseNonoperatingNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (1)

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1404
-Paragraph (a)

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

+ Details

Name:	us-gaap_NotesReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ahh_MezzanineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ahh_OtherNotesReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_DelrayPlazaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_InterlockCommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_NextonMultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_SolisApartmentsAtInterlockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_PointStreetApartmentsBaltimoreMarylandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_TheResidencesAtAnnapolisJunctionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ahh_AnnapolisJunctionApartmentsOwnerLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_NorthDecaturSquareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ahh_NextonSquareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Notes Receivable and Allowance for Loan Losses - Summary of Notes Receivable (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 07, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Apr. 01, 2021	Mar. 31, 2021	Sep. 22, 2020	May 31, 2020	Jan. 08, 2019	Dec. 21, 2018	Nov. 30, 2018	Oct. 27, 2017
Notes Receivable
Notes receivable guarantee premium		$ 1,243	$ 2,631
Notes receivable discount, net		(994)	(2,584)
Financing Receivable, after Allowance for Credit Loss, Total		126,429	135,432
Interest income		18,457	19,841	$ 23,215
Mezzanine Loan
Notes Receivable
Notes receivable		118,946	128,576
Maximum loan commitment		187,415
Interest income		18,026	19,783	23,127
Other notes receivable
Notes Receivable
Notes receivable		7,234	6,809
Interest income		431	58	88
Delray Beach Plaza \| Mezzanine Loan
Notes Receivable
Notes receivable		0	14,289
Maximum loan commitment		$ 17,000	17,000							$ 15,000			$ 13,100
Interest rate		15.00%											15.00%
Additional funds available			$ 2,000
Interest rate			6.00%
Interest income		$ 0	$ 489	1,622
Interlock Commercial \| Mezzanine Loan
Notes Receivable
Notes receivable		95,379	85,318
Maximum loan commitment		107,000			$ 107,000						$ 95,000
Interest rate											15.00%
Additional funds available		$ 3,000					$ 7,500		$ 8,000
Interest rate		18.00%
Interest income		$ 12,769	12,267	6,142
Interest income, exit fees		2,000	2,300	600
Nexton Multifamily \| Mezzanine Loan
Notes Receivable
Notes receivable		23,567	0
Maximum loan commitment		22,315				$ 22,300
Interest rate						11.00%					11.00%
Interest income		1,252	0	0
Solis Apartments At Interlock
Notes Receivable
Prepayment premium		2,400
Solis Apartments At Interlock \| Mezzanine Loan
Notes Receivable
Notes receivable		0	28,969
Maximum loan commitment		41,100									$ 41,100
Interest rate											13.00%
Interest income		4,005	3,382	2,333
Prepayment premium	$ 2,400
1405 Point \| Mezzanine Loan
Notes Receivable
Interest income		0	0	783
The Residences at Annapolis Junction \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Loan modification fee												$ 5,000
The Residences at Annapolis Junction \| Mezzanine Loan
Notes Receivable
Interest income		0	2,468	8,776
Interest income, exit fees			1,500	500
North Decatur Square \| Mezzanine Loan
Notes Receivable
Interest income		0	0	1,509
Nexton Square \| Mezzanine Loan
Notes Receivable
Notes receivable								$ 16,400
Interest income		$ 0	$ 1,177	$ 1,962