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SEGMENT REPORTING Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Real Estate at Cost $ 2,208,595akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost $ 1,819,053akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost $ 1,287,198akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
Total Assets 2,732,600akr_AssetsContinuedOperations 2,244,523akr_AssetsContinuedOperations 1,670,163akr_AssetsContinuedOperations
Acquisition of Real Estate 250,353akr_RealEstateAcquired 220,041akr_RealEstateAcquired 241,894akr_RealEstateAcquired
Redevelopment and Property Improvement Costs 140,118akr_InvestmentinRedevelopmentandImprovements 106,883akr_InvestmentinRedevelopmentandImprovements 82,127akr_InvestmentinRedevelopmentandImprovements
Core Portfolio [Member]      
Segment Reporting Information [Line Items]      
Real Estate at Cost 1,366,017akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 1,059,257akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 722,345akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember
Total Assets 1,615,436akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 1,012,553akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 727,423akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember
Acquisition of Real Estate 203,103akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 143,616akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 175,556akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember
Redevelopment and Property Improvement Costs 5,432akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 10,611akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		 3,862akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember
Opportunity Funds [Member]      
Segment Reporting Information [Line Items]      
Real Estate at Cost 842,578akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 759,796akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 564,853akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember
Total Assets 1,014,878akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 1,105,264akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 811,855akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember
Acquisition of Real Estate 47,250akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 76,425akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 66,338akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember
Redevelopment and Property Improvement Costs 134,686akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 96,272akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		 78,265akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember
Notes Receivable [Member]      
Segment Reporting Information [Line Items]      
Real Estate at Cost 0akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 0akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 0akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember
Total Assets 102,286akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 126,706akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 130,885akr_AssetsContinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember
Acquisition of Real Estate 0akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 0akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 0akr_RealEstateAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember
Redevelopment and Property Improvement Costs $ 0akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 $ 0akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember		 $ 0akr_InvestmentinRedevelopmentandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NotesReceivableMember