Consolidated and Combined Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$ 12,759us-gaap_ProfitLoss	$ 14,453us-gaap_ProfitLoss	$ 8,897us-gaap_ProfitLoss
Results from discontinued operations			10
Income from continuing operations	12,759	14,453	8,907
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	14,984us-gaap_Depreciation	12,806us-gaap_Depreciation	11,601us-gaap_Depreciation
Amortization of leasing costs and in-place lease intangibles	2,585	2,092	1,308
Accrued straight-line rental revenue	(2,203)us-gaap_StraightLineRent	(1,055)us-gaap_StraightLineRent	(2,158)us-gaap_StraightLineRent
Amortization of leasing incentives and above or below-market rents	632	683	755
Accrued straight-line ground rent expense	315us-gaap_AmortizationOfLeasedAsset	364us-gaap_AmortizationOfLeasedAsset	333us-gaap_AmortizationOfLeasedAsset
Bad debt expense	79us-gaap_ProvisionForDoubtfulAccounts	162us-gaap_ProvisionForDoubtfulAccounts	305us-gaap_ProvisionForDoubtfulAccounts
Noncash stock compensation	917us-gaap_ShareBasedCompensation	1,249us-gaap_ShareBasedCompensation
Impairment charges	15us-gaap_AssetImpairmentCharges	580us-gaap_AssetImpairmentCharges
Noncash interest expense	517us-gaap_PaidInKindInterest	636us-gaap_PaidInKindInterest	615us-gaap_PaidInKindInterest
Noncash loss on extinguishment of debt		644
Gain on real estate dispositions and acquisitions	(2,211)	(9,460)
Change in the fair value of derivatives	233us-gaap_UnrealizedGainLossOnDerivatives	12us-gaap_UnrealizedGainLossOnDerivatives	(408)us-gaap_UnrealizedGainLossOnDerivatives
Other noncash gain	(42)us-gaap_OtherNoncashIncomeExpense
Income from real estate joint ventures		(210)	(261)
Changes in operating assets and liabilities, net of acquisitions:
Property assets	(1,420)	7,761	(991)
Property liabilities	(1,069)	(2,836)	2,404
Construction assets	(5,893)	(2,115)	2,170
Construction liabilities	11,164	(3,591)	(2,220)
Net cash provided by continuing operations	31,362	22,175	22,360
Net cash used for discontinued operations			(34)
Net cash provided by operating activities	31,362	22,175	22,326
INVESTING ACTIVITIES
Development of real estate investments	(98,467)	(41,298)	(2,665)
Tenant and building improvements	(6,362)us-gaap_PaymentsForTenantImprovements	(3,920)us-gaap_PaymentsForTenantImprovements	(2,307)us-gaap_PaymentsForTenantImprovements
Acquisitions of real estate investments, net of cash acquired	(2,754)	(2,106)
Dispositions of real estate investments	7,387
Government development grants	300	300	400
(Increase) decrease in restricted cash	(1,824)	93	184
Leasing costs	(2,835)us-gaap_PaymentsForLeasingCosts	(1,180)us-gaap_PaymentsForLeasingCosts	(741)us-gaap_PaymentsForLeasingCosts
Leasing incentives	(751)	(266)	(475)
Contributions to real estate joint ventures		(81)
Return of capital from real estate joint ventures		511	405
Net cash used for continuing operations	(105,306)	(47,947)	(5,199)
Net cash provided by discontinued operations			497
Net cash used for investing activities	(105,306)	(47,947)	(4,702)
FINANCING ACTIVITIES
Proceeds from sale of common stock	49,566	203,245
Offering costs	(416)us-gaap_PaymentsOfStockIssuanceCosts	(7,937)us-gaap_PaymentsOfStockIssuanceCosts	(3,125)us-gaap_PaymentsOfStockIssuanceCosts
Formation transactions		(47,450)
Debt issuances, credit facility and construction loan borrowings	117,645us-gaap_ProceedsFromIssuanceOfDebt	106,054us-gaap_ProceedsFromIssuanceOfDebt	30,612us-gaap_ProceedsFromIssuanceOfDebt
Debt and credit facility repayments, including principal amortization	(63,306)us-gaap_RepaymentsOfDebt	(197,478)us-gaap_RepaymentsOfDebt	(35,093)us-gaap_RepaymentsOfDebt
Debt issuance costs	(448)us-gaap_PaymentsOfDebtIssuanceCosts	(2,738)us-gaap_PaymentsOfDebtIssuanceCosts	(931)us-gaap_PaymentsOfDebtIssuanceCosts
Dividends and distributions	(22,096)us-gaap_PaymentsOfDividends	(7,733)us-gaap_PaymentsOfDividends
Predecessor contributions		2,218us-gaap_ProceedsFromContributedCapital	1,655us-gaap_ProceedsFromContributedCapital
Predecessor distributions		(12,927)ahh_DistributionsNetOfContributions	(14,791)ahh_DistributionsNetOfContributions
Net cash provided by (used for) continuing operations	80,945	35,254	(21,673)
Net cash used for discontinued operations	0	0	0
Net cash provided by (used for) financing activities	80,945	35,254	(21,673)
Net increase (decrease) in cash and cash equivalents	7,001	9,482	(4,049)
Cash and cash equivalents, beginning of period	18,882	9,400	13,449
Cash and cash equivalents, end of period	25,883	18,882	9,400
Supplemental cash flow information:
Cash paid for interest	12,132us-gaap_InterestPaidNet	12,617us-gaap_InterestPaidNet	16,161us-gaap_InterestPaidNet
Cash paid for income taxes	$ 821us-gaap_IncomeTaxesPaidNet

Amortization of lease incentives and above and below market rents.

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Distributions net of contributions.

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Gains on dispositions and acquisition of real estate.

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Increase decrease in deferred lease incentives.

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This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of cash outflow for costs that are essential to originate the lease and would not otherwise have been incurred without the lease agreement. Amount includes, but is not limited to, cash outflows to evaluate the lessee's credit condition, guarantees, and collateral and cash outflows for costs incurred in negotiating, processing, and executing the lease agreement.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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Payments to develop real estate assets is the process of adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements; and are generally classified as cash flow from investing activities.

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The cash inflow associated with the amount received by a corporation from a shareholder during the period.

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Difference between actual rental income due and rental income recognized on a straight-line basis.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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