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Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended
Sep. 15, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Jan. 17, 2014
Aug. 15, 2014
Jan. 08, 2015
Jan. 28, 2015
Class of Stock [Line Items]                
Shares issued through public offering 5,750,000us-gaap_StockIssuedDuringPeriodSharesNewIssues              
Net proceeds from public offering $ 49,300us-gaap_ProceedsFromIssuanceOfCommonStock   $ 49,566us-gaap_ProceedsFromIssuanceOfCommonStock $ 203,245us-gaap_ProceedsFromIssuanceOfCommonStock        
Authorized capital shares of common stock     500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized        
Authorized capital shares of preferred stock     100,000,000us-gaap_PreferredStockSharesAuthorized 100,000,000us-gaap_PreferredStockSharesAuthorized        
Shares of common stock issued     25,022,701us-gaap_CommonStockSharesIssued 19,163,413us-gaap_CommonStockSharesIssued        
Shares of common stock outstanding     25,022,701us-gaap_CommonStockSharesOutstanding 19,163,413us-gaap_CommonStockSharesOutstanding        
Preferred stock issued     0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued        
Preferred stock outstanding     0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding        
Percentage of Operating Partnership held     62.90%ahh_PercentageOfOwnershipInterestsInOperatingPartnership 59.50%ahh_PercentageOfOwnershipInterestsInOperatingPartnership        
Common units in exchange for all noncontrolling interests   30,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits            
Aggregate cash dividends and distributions, paid     22,096us-gaap_PaymentsOfDividends 7,733us-gaap_PaymentsOfDividends        
Cash dividend per share, declared     $ 0.64us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared        
Common Stockholders [Member]                
Class of Stock [Line Items]                
Aggregate cash dividends and distributions, paid     13,200us-gaap_PaymentsOfDividends
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ahh_CommonStockholdersMember		 4,600us-gaap_PaymentsOfDividends
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ahh_CommonStockholdersMember		        
Common Unitholders [Member]                
Class of Stock [Line Items]                
Aggregate cash dividends and distributions, paid     8,900us-gaap_PaymentsOfDividends
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ahh_CommonUnitHoldersMember		 3,100us-gaap_PaymentsOfDividends
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ahh_CommonUnitHoldersMember		        
Liberty Apartments [Member]                
Class of Stock [Line Items]                
Acquisition, common units issued         695,652us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ahh_LibertyApartmentsMember		      
Dimmock Square [Member]                
Class of Stock [Line Items]                
Acquisition, common units issued           990,952us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ahh_DimmockSquareMember		    
Subsequent Event [Member] | Common Stockholders [Member]                
Class of Stock [Line Items]                
Aggregate cash dividends and distributions, paid             4,000us-gaap_PaymentsOfDividends
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ahh_CommonStockholdersMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Subsequent Event [Member] | Common Unitholders [Member]                
Class of Stock [Line Items]                
Aggregate cash dividends and distributions, paid             $ 2,400us-gaap_PaymentsOfDividends
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ahh_CommonUnitHoldersMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Subsequent Event [Member] | Dividend Declared [Member]                
Class of Stock [Line Items]                
Cash dividend per share, declared               $ 0.17us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Cash dividend, date of record               Apr. 01, 2015