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Related Party Transactions - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014
Related Party Transaction [Line Items]
Revenue from contracts with affiliated entities		$ 1,500,000us-gaap_RevenueFromRelatedParties	$ 2,300,000us-gaap_RevenueFromRelatedParties
Operating Margin			100,000ahh_OperatingMarginFromRelatedParties
Reimbursed real estate taxes and insurance costs	200,000
Maximum [Member]
Related Party Transaction [Line Items]
Operating Margin		$ 100,000

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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