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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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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Data Type:	num:percentItemType
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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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Balance Type:	credit
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- Definition

Financing Receivable, Maximum Commitment, Excluding Accrued Interest Reserves

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No definition available.

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- Definition

Financing Receivable, Term

+ References

No definition available.

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- Definition

Financing Receivable, Term, Extension Option

+ References

No definition available.

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- Definition

Guarantor Obligations, Maximum Exposure, Undiscounted, Percentage

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No definition available.

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- Definition

Interest Income, Exit Fees

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No definition available.

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

- Definition

Loan Modification Fee, Loan Discount

+ References

No definition available.

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

- Definition

Note Receivable Face Amount

+ References

No definition available.

+ Details

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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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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

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Rooms In Hotel

+ References

No definition available.

+ Details

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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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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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- Definition

Purchase Option, Selling Price

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Repayment Of Accrued Interest

+ References

No definition available.

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- Definition

Repayments Of Principal

+ References

No definition available.

+ Details

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- 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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- Definition

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

+ References

No definition available.

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- 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.

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No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

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

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- 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.

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- Definition

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

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- Definition

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

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- Definition

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

+ References

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- Definition

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

+ References

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- 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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- 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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- 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.

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- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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- 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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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Name Accounting Standards Codification
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- Definition

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

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- 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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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) ft² in Thousands										1 Months Ended	12 Months Ended
Notes Receivable (Details) ft² in Thousands	Dec. 27, 2019 USD ($)	Jul. 22, 2019 USD ($)	Apr. 24, 2019 USD ($)	Feb. 08, 2019 USD ($)	Dec. 21, 2018 USD ($)	Dec. 04, 2018	Nov. 16, 2018 USD ($)	Sep. 30, 2016 USD ($)	Oct. 15, 2015 USD ($)	Aug. 31, 2018 USD ($) building	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2019	Apr. 19, 2019 USD ($)	Jan. 08, 2019 USD ($)	Nov. 07, 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											270,851,000	173,855,000	$ 160,661,000
Guaranty liabilities											5,271,000	2,800,000
Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)											56,734,000
Annapolis Junction Town Center
Notes Receivable
Number of residential units \| unit																					416
Area of retail space \| ft²																					17
Period after completion to exercise purchase option								1 year
Note receivable maximum principal balance																					$ 48,100,000
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)								$ 25,000,000.0
Annapolis Junction Town Center \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Construction loan (up to)								$ 60,000,000.0
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
Loan modification fee							$ 5,000,000.0
Payment for debt extinguishment fee							3,000,000.0
Selling price											5,000,000.0
Debt repayments							11,100,000
Repayment of accrued interest							9,900,000
Repayments of principal							1,200,000
Delray Plaza \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)											$ 5,180,000								$ 4,800,000
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)				$ 12,600,000							$ 12,600,000
Interlock Commercial \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)											30,654,000
Decatur, Georgia \| Whole Foods Anchored Center \| Loans Receivable
Notes Receivable
Investment in development																				$ 34,000,000.0
Delray Beach, Florida \| Whole Foods Anchored Center \| Loans Receivable
Notes Receivable
Investment in development																			20,000,000.0
Mezzanine Loan
Notes Receivable
Maximum loan commitment											276,910,000
Notes receivable											152,953,000	139,097,000
Mezzanine Loan \| 1405 Point
Notes Receivable
Maximum loan commitment											$ 31,032,000
Interest rate											8.00%
Notes receivable											$ 0	30,238,000
Mezzanine Loan \| The Residences at Annapolis Junction
Notes Receivable
Maximum loan commitment											$ 48,105,000
Interest rate											10.00%
Interest income, exit fees											$ 500,000
Notes receivable											40,049,000	36,361,000
Mezzanine Loan \| North Decatur Square
Notes Receivable
Maximum loan commitment											$ 29,673,000	29,700,000								$ 21,800,000
Interest rate											15.00%
Notes receivable											$ 0	18,521,000
Proceeds from collection of loans receivable		$ 20,000,000.0
Mezzanine Loan \| Delray Plaza
Notes Receivable
Maximum loan commitment											$ 15,000,000					$ 15,000,000.0			$ 13,100,000
Interest rate											15.00%								15.00%
Notes receivable											$ 12,995,000	7,032,000
Mezzanine Loan \| Delray Plaza \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)																$ 5,200,000
Mezzanine Loan \| Nexton Square
Notes Receivable
Maximum loan commitment											$ 17,000,000
Interest rate						15.00%					10.00%			15.00%
Interest rate, upon completion of portion of project						10.00%
Notes receivable											$ 15,097,000	14,855,000
Proceeds from collection of loans receivable				2,100,000
Mezzanine Loan \| Interlock Commercial
Notes Receivable
Maximum loan commitment					$ 95,000,000.0						$ 95,000,000
Interest rate											15.00%
Interest income, exit fees											$ 600,000
Notes receivable											59,224,000	18,269,000
Maximum commitment, excluding accrued interest reserves					$ 67,000,000.0
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						$ 41,100,000
Interest rate											13.00%
Notes receivable											$ 25,588,000	$ 13,821,000
Bridge Loan \| Nexton Square
Notes Receivable
Maximum loan commitment																	$ 4,900,000
Construction Loans \| SC Summerville Brighton, LLC \| Line of Credit
Notes Receivable
Aggregate capacity under the credit facility				$ 25,200,000
Construction Loans \| Interlock Commercial \| Financial Guarantee
Notes Receivable
Guarantor obligations of the senior construction loan (up to)															$ 30,700,000
Bridge Loan \| The Residences at Annapolis Junction \| Annapolis Junction Apartments Owner LLC
Notes Receivable
Guarantor obligations of the senior construction loan (up to)							8,300,000
Debt, face value							$ 83,000,000.0
Bridge Loan \| Shopping Center In Summerville, South Carolina
Notes Receivable
Notes receivable										$ 2,200,000
Bridge Loan \| Interlock Commercial
Notes Receivable
Notes receivable																		$ 4,000,000.0
First Purchase Option \| 1405 Point
Notes Receivable
Acquisition, cash consideration			$ 300,000
Option to acquire additional interest			79.00%
First Purchase Option \| Annapolis Junction Town Center
Notes Receivable
Interest acquired								80.00%
1405 Point
Notes Receivable
Commitment to invest in a development project (up to)									$ 28,200,000
Acquisition, cash consideration			$ 300,000
Loans payable	$ 53,000,000.0		$ 64,900,000
Option to acquire additional interest			79.00%
Debt repayments	$ 12,300,000