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MORTGAGE AND OTHER NOTES PAYABLE - MORTGAGE BY PROPERTY (Details) (Mortgages, USD $)	3 Months Ended
	Mar. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Debt instrument face amount	$ 51,765,000us-gaap_DebtInstrumentFaceAmount
Repayments of long-term debt	28,000,000us-gaap_RepaymentsOfLongTermDebt
Libor Plus 2.25% Mortgage Note | 1035 Third Ave
Mortgage Loans on Real Estate [Line Items]
Debt instrument face amount	42,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = akr_LiborPlusTwoPointTwoFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkMember
Description of variable rate basis	LIBOR
Basis spread on variable rate	2.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_LiborPlusTwoPointTwoFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkMember
Effective rate	2.52%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LiborPlusTwoPointTwoFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkMember
Libor Plus 1.55% Mortgage Note | Lincoln Park Centre
Mortgage Loans on Real Estate [Line Items]
Debt instrument face amount	0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = akr_LiborPlusOnePointFiveFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageMember
Description of variable rate basis	LIBOR
Basis spread on variable rate	1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_LiborPlusOnePointFiveFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageMember
Effective rate	1.62%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LiborPlusOnePointFiveFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageMember
Repayments of long-term debt	28,000,000us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = akr_LiborPlusOnePointFiveFivePercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageMember
4.66% Mortgage note | 163 Highland Avenue
Mortgage Loans on Real Estate [Line Items]
Debt instrument face amount	$ 9,765,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = akr_FivePointSixFourPercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember
Stated interest rate percentage	4.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = akr_FivePointSixFourPercentMortgageNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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