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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable and Preferred Equity Investments $ 102,286akr_NotesReceivableandPreferredEquityInvestmentsFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 126,656akr_NotesReceivableandPreferredEquityInvestmentsFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Mortgage, Convertible Notes and Other Notes Payable 1,130,481us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 1,039,997us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable and Preferred Equity Investments 102,286akr_NotesReceivableandPreferredEquityInvestmentsFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 126,656akr_NotesReceivableandPreferredEquityInvestmentsFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Mortgage, Convertible Notes and Other Notes Payable $ 1,141,371us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 1,056,457us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember