Property Occupancy Rate

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=ahh_GeneralContractingAndRealEstateServicesRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=ahh_GeneralContractingAndRealEstateServicesSegmentProfitMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=ahh_RentalRevenueMember
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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Line of credit, performance and payment bonds	$ 192.2us-gaap_ContractualObligation	$ 35.8us-gaap_ContractualObligation
Ground rent expense	1.8us-gaap_OperatingLeasesRentExpenseNet	1.5us-gaap_OperatingLeasesRentExpenseNet	1.5us-gaap_OperatingLeasesRentExpenseNet
Rental Revenues [Member] \| Hampton Roads Properties [Member]
Loss Contingencies [Line Items]
Concentrations of Credit Risk	69.00%	70.00%	75.00%
Rental Revenues [Member] \| Town Center Properties [Member]
Loss Contingencies [Line Items]
Concentrations of Credit Risk	47.00%	48.00%	51.00%
Rental Revenues [Member] \| Richmond Tower [Member]
Loss Contingencies [Line Items]
Concentrations of Credit Risk	13.00%	15.00%	16.00%
Rental Revenues [Member] \| Minimum [Member] \| Williams Mullen [Member]
Loss Contingencies [Line Items]
Area of Richmond Tower occupied	80.00%
General Contracting and Real Estate Services Revenues [Member] \| Baltimore [Member]
Loss Contingencies [Line Items]
Concentrations of Credit Risk	41.00%
General Contracting and Real Estate Services Segment Profit [Member] \| Baltimore [Member]
Loss Contingencies [Line Items]
Concentrations of Credit Risk	27.00%
Operating Partnership [Member]
Loss Contingencies [Line Items]
Outstanding letters of credit	$ 8.5	$ 3.0