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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Core Portfolio (Details) (Core Portfolio)	Mar. 31, 2015 sqft
Crossroads
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_CrossroadsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Square footage of real estate property (in square feet)	311,000us-gaap_AreaOfRealEstateProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_CrossroadsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Route 202 Shopping Center
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	22.22%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_Route202ShoppingCenterMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Square footage of real estate property (in square feet)	20,000us-gaap_AreaOfRealEstateProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_Route202ShoppingCenterMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_GeorgetownPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Square footage of real estate property (in square feet)	28,000us-gaap_AreaOfRealEstateProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_GeorgetownPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Chicago Street Retail Portfolio
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	88.43%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Square footage of real estate property (in square feet)	87,000us-gaap_AreaOfRealEstateProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember

X

- Definition

Area of a real estate property.

+ References

No definition available.

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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