CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Rental income	$ 145,103	$ 122,730	$ 84,002
Interest income	12,607akr_MortgageInterestIncome	11,800akr_MortgageInterestIncome	8,027akr_MortgageInterestIncome
Expense reimbursements	32,642us-gaap_TenantReimbursements	28,373us-gaap_TenantReimbursements	20,433us-gaap_TenantReimbursements
Other	4,660us-gaap_OtherRealEstateRevenue	5,383us-gaap_OtherRealEstateRevenue	2,525us-gaap_OtherRealEstateRevenue
Total revenues	195,012us-gaap_RealEstateRevenueNet	168,286us-gaap_RealEstateRevenueNet	114,987us-gaap_RealEstateRevenueNet
Operating Expenses
Property operating	24,833	21,026	17,430
Other operating	3,776us-gaap_OtherCostAndExpenseOperating	4,605us-gaap_OtherCostAndExpenseOperating	3,899us-gaap_OtherCostAndExpenseOperating
Real estate taxes	23,062us-gaap_RealEstateTaxExpense	20,922us-gaap_RealEstateTaxExpense	16,387us-gaap_RealEstateTaxExpense
General and administrative	27,433us-gaap_GeneralAndAdministrativeExpense	25,555us-gaap_GeneralAndAdministrativeExpense	21,223us-gaap_GeneralAndAdministrativeExpense
Reserve for notes receivable	0	0	405
Depreciation and amortization	49,645us-gaap_DepreciationAndAmortization	40,299us-gaap_DepreciationAndAmortization	27,888us-gaap_DepreciationAndAmortization
Total operating expenses	128,749us-gaap_OperatingExpenses	112,407us-gaap_OperatingExpenses	87,232us-gaap_OperatingExpenses
Operating income	66,263us-gaap_OperatingIncomeLoss	55,879us-gaap_OperatingIncomeLoss	27,755us-gaap_OperatingIncomeLoss
Equity in earnings of unconsolidated affiliates	8,723	12,382	550
Gain on disposition of properties of unconsolidated affiliates	102,855	0	3,061
Impairment of unconsolidated affiliates	0	0	(2,032)
Impairment of asset	0us-gaap_AssetImpairmentCharges	(1,500)us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Loss on debt extinguishment	(335)	(765)	(198)
Gain on involuntary conversion of asset	0	0	2,368
Interest and other finance expense	(39,091)us-gaap_InterestAndDebtExpense	(39,474)us-gaap_InterestAndDebtExpense	(22,811)us-gaap_InterestAndDebtExpense
Gain on disposition of properties	13,138	0	0
Income from continuing operations before income taxes	151,553	26,522	8,693
Income tax (provision) benefit	(629)us-gaap_IncomeTaxExpenseBenefit	(19)us-gaap_IncomeTaxExpenseBenefit	574us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations	150,924	26,503	9,267
Discontinued operations
Operating income from discontinued operations	0	6,818	12,007
Impairment of asset	0	(6,683)	0
Loss on debt extinguishment	0	(800)	(2,541)
Gain on disposition of properties	1,222	18,802	71,203
Income from discontinued operations	1,222	18,137	80,669
Net income	152,146us-gaap_ProfitLoss	44,640us-gaap_ProfitLoss	89,936us-gaap_ProfitLoss
Noncontrolling interests
Continuing operations	(80,059)	7,523	14,352
Discontinued operations	(1,023)	(12,048)	(64,582)
Net income attributable to noncontrolling interests	(81,082)	(4,525)	(50,230)
Net income attributable to Common Shareholders	$ 71,064	$ 40,115	$ 39,706
Basic earnings per share
Income from continuing operations (in dollars per share)	$ 1.18	$ 0.61	$ 0.51
Income from discontinued operations (in dollars per share)	$ 0.00	$ 0.11	$ 0.34
Basic earnings per share (in dollars per share)	$ 1.18us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic
Diluted earnings per share
Income from continuing operations (in dollars per share)	$ 1.18	$ 0.61	$ 0.51
Income from discontinued operations (in dollars per share)	$ 0.00	$ 0.11	$ 0.34
Diluted earnings per share (in dollars per share)	$ 1.18us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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-Number 210

-Section 04

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

+ References

No definition available.

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Period Type:	duration

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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue.

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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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- Definition

Other real estate revenue not otherwise specified in the taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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 loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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-Paragraph 11B

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Period Type:	duration

- Definition

The aggregate revenue from real estate operations during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Balance Type:	credit
Period Type:	duration

- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

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-Name Accounting Standards Codification

-Topic 720

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-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843

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- Definition

In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses.

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