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CONVERTIBLE NOTES PAYABLE (Details) (Convertible Notes Payable [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 20, 2011
Jan. 31, 2007
Convertible Notes Payable [Member]
      
Convertible Notes Payable [Abstract]      
Debt issued amount     $ 115,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Interest rate, stated percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		   3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Effective interest rate 3.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 [1] 6.03%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		  
Convertible notes repurchased $ 114,600,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		    
Redemption price, percentage of principal amount plus accrued and unpaid interest 100.00%akr_RedemptionPricePercentageOfPrincipalAmountPlusAccruedAndUnpaidInterest
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		    
[1] Holders of the Convertible Notes may require the Company to repurchase them at par on December 15, 2016 and December 15, 2021. The Company may redeem the Convertible Notes, in whole, or in part, at any time