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FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable and Preferred Equity Investments	$ 96,307	$ 126,656
Mortgage, Convertible Notes and Other Notes Payable	1,074,029	1,039,997
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable and Preferred Equity Investments	96,307	126,656
Mortgage, Convertible Notes and Other Notes Payable	$ 1,092,818	$ 1,056,457

X

- Definition

Notes Receivable and Preferred Equity Investments, Fair Value

+ References

No definition available.

+ Details

Name:	akr_NotesReceivableandPreferredEquityInvestmentsFairValue
Namespace Prefix:	akr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant