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Construction Contracts - Net Position of Uncompleted Construction Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Contractors [Abstract]    
Costs incurred on uncompleted construction contracts $ 195,219ahh_CostsOnUncompletedContracts $ 97,372ahh_CostsOnUncompletedContracts
Estimated earnings 8,501ahh_EstimatedEarningsOnUncompletedContracts 4,584ahh_EstimatedEarningsOnUncompletedContracts
Billings (204,501)us-gaap_BilledContractReceivables (102,319)us-gaap_BilledContractReceivables
Net position (781)ahh_UncompletedContractsNet (363)ahh_UncompletedContractsNet
Construction contract costs and estimated earnings in excess of billings 272us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 1,178us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Billings in excess of construction contract costs and estimated earnings (1,053)us-gaap_BillingsInExcessOfCost (1,541)us-gaap_BillingsInExcessOfCost
Net position $ (781)ahh_UncompletedContractsNet $ (363)ahh_UncompletedContractsNet