Business Acquisition Percentage of Voting Interests Acquired Option To Purchase Additional Interests

No definition available.

Name:	ahh_BusinessAcquisitionPercentageofVotingInterestsAcquiredOptionToPurchaseAdditionalInterests
Namespace Prefix:	ahh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the company's commitment to invest in a development project.

+ References

No definition available.

+ Details

Name:	ahh_CommitmentToInvestInDevelopmentProject
Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Financing Receivable, Interest Rate, Stated Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Financing Receivable, Interest Rate, Stated Percentage, Upon Completion Of Portion Of Project

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableInterestRateStatedPercentageUponCompletionOfPortionOfProject
Namespace Prefix:	ahh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Financing Receivable, Maximum Commitment, Excluding Accrued Interest Reserves

+ References

No definition available.

+ Details

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

- Definition

Financing Receivable, Term

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing Receivable, Term, Extension Option

+ References

No definition available.

+ Details

Name:	ahh_FinancingReceivableTermExtensionOption
Namespace Prefix:	ahh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Guarantor Obligations, Maximum Exposure, Undiscounted, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Duration Of Extension Option

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Note Receivable Face Amount

+ References

No definition available.

+ Details

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

- Definition

Number of buildings acquired.

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of residential units in a property.

+ References

No definition available.

+ Details

Name:	ahh_NumberOfResidentialUnits
Namespace Prefix:	ahh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Rooms In Hotel

+ References

No definition available.

+ Details

Name:	ahh_NumberOfRoomsInHotel
Namespace Prefix:	ahh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of stories in a building.

+ References

No definition available.

+ Details

Name:	ahh_NumberOfStoriesInBuilding
Namespace Prefix:	ahh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Purchase Option Price As Percentage Of Lessor Of Budget Or Cost, First Option

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase Option Price As Percentage Of Lessor Of Budget Or Cost, Second Option

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase Option, Selling Price

+ References

No definition available.

+ Details

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

- Definition

Repayment Of Accrued Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Repayments Of Principal

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the time period after a project's completion date in which the company can exercise the option to purchase an interest in the project.

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Time Period After The Project Completion Date In Which The Company Can Exercise Additional Interests Purchase Option

+ References

No definition available.

+ Details

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Namespace Prefix:	ahh_
Data Type:	xbrli:durationItemType
Balance Type:	na
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.

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Period Type:	instant

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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-Paragraph 8
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Balance Type:	credit
Period Type:	duration

- Definition

This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Balance Type:	credit
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

+ Details

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

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

+ Details

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Period Type:	instant

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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-Paragraph 4
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- Definition

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Balance Type:	credit
Period Type:	instant

- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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

- Definition

The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

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

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Notes Receivable (Details)								1 Months Ended	12 Months Ended
Notes Receivable (Details)	Feb. 08, 2019 USD ($)	Dec. 21, 2018 USD ($)	Dec. 04, 2018 USD ($)	Nov. 16, 2018 USD ($)	Nov. 10, 2016 USD ($)	Sep. 30, 2016 USD ($)	Oct. 15, 2015 USD ($) ft² unit story	Aug. 31, 2018 USD ($) building	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 08, 2019 USD ($)	Nov. 21, 2018 USD ($)	Nov. 10, 2018 USD ($)	Oct. 31, 2018 USD ($)	Oct. 27, 2017 USD ($)	May 15, 2017 USD ($)	Apr. 21, 2016 USD ($) ft² unit room
Notes Receivable
Allowances for loan losses									$ 0	$ 0
Provision for loan losses									0	0	$ 0
Debt repayments									173,855,000	160,661,000	$ 186,533,000
Notes receivable									138,683,000	83,058,000
Guaranty liabilities									2,800,000
Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)									$ 56,507,000
1405 Point
Notes Receivable
Commitment to invest in a development project (up to)							$ 28,200,000.0
Number of stories \| story							17
Number of residential units \| unit							289
Area of retail space \| ft²							18,000
Interest acquired					88.00%				21.00%
1405 Point \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)					$ 25,000,000.0				$ 25,000,000
1405 Point \| Financial Guarantee \| Letter of Credit
Notes Receivable
Credit facility, amount outstanding									2,100,000	2,100,000
1405 Point \| BDG
Notes Receivable
Construction loan (up to)					67,000,000
Annapolis Junction Town Center
Notes Receivable
Number of residential units \| unit																		416
Area of retail space \| ft²																		17,000
Period after completion to exercise purchase option						1 year
Note receivable maximum principal balance																		$ 48,100,000.0
Number of rooms (room) \| room																		150
Interest acquired						88.00%
Purchase option price as percentage of lessor of budget or cost, first option						91.00%
Option to acquire additional interest						8.00%
Purchase option price as percentage of lessor of budget or cost, second option						9.00%
Period after completion to exercise additional purchase option						27 months
Annapolis Junction Town Center \| Loans Receivable
Notes Receivable
Interest rate																		10.00%
Annapolis Junction Town Center \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)						$ 25,000,000
Annapolis Junction Town Center \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Construction loan (up to)						$ 60,000,000
Debt repayments				$ 11,100,000
Repayment of accrued interest				9,900,000
Repayments of principal				1,200,000
The Residences at Annapolis Junction \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)									8,300,000
The Residences at Annapolis Junction \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Selling price									5,000,000
Delray Plaza \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)									$ 4,750,000
Shopping Center In Summerville, South Carolina
Notes Receivable
Number of buildings \| building								16
Nexton Square
Notes Receivable
Guarantor obligations percentage									50.00%
Nexton Square \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)									$ 0
Interlock Commercial
Notes Receivable
Guarantor obligations percentage									35.00%
Interlock Commercial \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)									$ 0
Solis Apartments At Interlock \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)									0
Decatur, Georgia \| Whole Foods Anchored Center \| Loans Receivable
Notes Receivable
Investment in development																	$ 34,000,000
Delray Beach, Florida \| Whole Foods Anchored Center \| Loans Receivable
Notes Receivable
Investment in development																$ 20,000,000
Mezzanine Loan
Notes Receivable
Maximum loan commitment									280,910,000
Notes receivable									139,097,000	82,634,000
Mezzanine Loan \| 1405 Point
Notes Receivable
Maximum loan commitment									$ 31,032,000					$ 31,000,000
Interest rate									8.00%
Notes receivable									$ 30,238,000	22,444,000
Mezzanine Loan \| The Residences at Annapolis Junction
Notes Receivable
Maximum loan commitment									$ 48,105,000
Interest rate									10.00%
Notes receivable									$ 36,361,000	43,021,000
Mezzanine Loan \| North Decatur Square
Notes Receivable
Maximum loan commitment									$ 29,673,000								$ 21,800,000
Interest rate									15.00%
Notes receivable									$ 18,521,000	11,790,000
Mezzanine Loan \| Delray Plaza
Notes Receivable
Maximum loan commitment									$ 15,000,000							$ 13,100,000
Interest rate									15.00%							15.00%
Notes receivable									$ 7,032,000	5,379,000
Mezzanine Loan \| Nexton Square
Notes Receivable
Maximum loan commitment			$ 21,000,000
Interest rate									15.00%
Interest rate, upon completion of portion of project			10.00%
Notes receivable									$ 14,855,000	0
Mezzanine Loan \| Interlock Commercial
Notes Receivable
Maximum loan commitment		$ 95,000,000							$ 95,000,000
Interest rate									15.00%
Notes receivable									$ 18,269,000	0
Maximum commitment, excluding accrued interest reserves		$ 67,000,000
Financing receivable term		24 months
Financing receivable term extension option		5 years
Mezzanine Loan \| Solis Apartments At Interlock
Notes Receivable
Maximum commitment, excluding accrued interest reserves		$ 25,200,000
Mezzanine Loan \| Solis Apartments at Interlock
Notes Receivable
Maximum loan commitment									$ 41,100,000
Interest rate									13.00%
Notes receivable									$ 13,821,000	$ 0
Bridge Loan \| Nexton Square
Notes Receivable
Maximum loan commitment													$ 4,900,000
Bridge Loan \| Annapolis Junction Town Center \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)				8,300,000.0
Bridge Loan \| Annapolis Junction Town Center \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Debt, face value				$ 83,000,000
Bridge Loan \| The Residences at Annapolis Junction \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Expiration period				1 year
Duration of extension option				1 year
Bridge Loan \| Shopping Center In Summerville, South Carolina
Notes Receivable
Notes receivable								$ 2,200,000
Bridge Loan \| Interlock Commercial
Notes Receivable
Notes receivable															$ 4,000,000
First Purchase Option \| 1405 Point
Notes Receivable
Purchase price					$ 27,600,000
Period after completion to exercise purchase option					1 year
Option to acquire additional interest					79.00%
First Purchase Option \| Annapolis Junction Town Center
Notes Receivable
Interest acquired						80.00%
Second Purchase Option \| 1405 Point
Notes Receivable
Purchase price					$ 3,100,000
Period after completion to exercise purchase option					27 months
Option to acquire additional interest					9.00%
Subsequent Event \| Delray Plaza \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)												$ 5,200,000
Subsequent Event \| Nexton Square \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)	$ 12,600,000
Subsequent Event \| Mezzanine Loan \| Delray Plaza
Notes Receivable
Maximum loan commitment												$ 15,000,000
Subsequent Event \| Mezzanine Loan \| Nexton Square
Notes Receivable
Proceeds from collection of loans receivable	2,100,000
Subsequent Event \| Construction Loans \| SC Summerville Brighton, LLC \| Line of Credit
Notes Receivable
Aggregate capacity under the credit facility	$ 25,200,000