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Real Estate Investments - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 17, 2014
Aug. 15, 2014
May 13, 2013
Liberty Apartments [Member]      
Real Estate Properties [Line Items]      
Land $ 3,580us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
Site improvements 280ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSiteImprovements
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
Building and improvements 23,214us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
In-place leases 340us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
Net working capital (679)ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
Indebtedness (16,966)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
Net assets acquired 9,769us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember
   
Dimmock Square [Member]      
Real Estate Properties [Line Items]      
Land   5,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember
 
Site improvements   600ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSiteImprovements
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember
 
Building and improvements   12,526us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember
 
In-place leases   1,880us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember
 
Above and below-market leases   (390)ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAboveOrBelowMarketLeaseIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember
 
Net assets acquired   19,716us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember
 
Bermuda Crossroads [Member]      
Real Estate Properties [Line Items]      
Land     5,450us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Site improvements     540ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSiteImprovements
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Building and improvements     10,101us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Intangible assets     2,860us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Net working capital     237ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Indebtedness     (11,053)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Below-market leases     (1,750)ahh_BusinessAcquisitionBelowMarketLease
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Net assets acquired     6,385us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ahh_BermudaCrossroadsMember
Smith's Landing [Member]      
Real Estate Properties [Line Items]      
Site improvements     450ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSiteImprovements
/ us-gaap_BusinessAcquisitionAxis
= ahh_SmithLandingMember
Building and improvements     34,655us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ us-gaap_BusinessAcquisitionAxis
= ahh_SmithLandingMember
Intangible assets     2,420us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ahh_SmithLandingMember
Net working capital     14ahh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= ahh_SmithLandingMember
Indebtedness     (24,995)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ahh_SmithLandingMember
Net assets acquired     $ 12,544us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ahh_SmithLandingMember