Derivative effective month year.

No definition available.

Name:	akr_DerivativeEffectiveMonthYear
Namespace Prefix:	akr_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Derivative maturity month year.

+ References

No definition available.

+ Details

Name:	akr_DerivativeMaturityMonthYear
Namespace Prefix:	akr_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

+ Details

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=akr_FundIVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=akr_CorePortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=akr_FundPortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=akr_FundIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=akr_FundVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Feb. 29, 2020
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ (45,027)	$ (89,612)
Derivative Assets	7	1
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	16,700	30,400	$ 50,000
Fund IV \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	23,316
Core Portfolio
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	539,369
Fair value, derivatives, net	(40,650)	(74,990)
Core Portfolio \| Interest Rate Swaps \| Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	539,369
Fair value, liability derivatives	$ (40,650)	(74,990)
Core Portfolio \| Interest Rate Swaps \| Minimum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2012-12
Derivative Maturity Date	2022-03
Strike Rate	1.71%
Core Portfolio \| Interest Rate Swaps \| Maximum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2020-07
Derivative Maturity Date	2030-07
Strike Rate	3.77%
Fund Portfolio \| Fund II
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 45,000
Fair value, derivatives, net		(219)
Fund Portfolio \| Fund II \| Interest Rate Swaps \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2014-10
Derivative Maturity Date	2021-11
Fair value, liability derivatives		(219)
Fund Portfolio \| Fund II \| Interest Rate Swaps \| Minimum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Strike Rate	1.49%
Fund Portfolio \| Fund II \| Interest Rate Swaps \| Maximum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Strike Rate	1.49%
Fund Portfolio \| Fund II \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 45,000
Derivative Effective Date	2019-03
Derivative Maturity Date	2022-03
Derivative Assets	$ 0	0
Fund Portfolio \| Fund II \| Interest Rate Caps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.50%
Fund Portfolio \| Fund II \| Interest Rate Caps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.50%
Fund Portfolio \| Fund IV
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 94,654
Fair value, derivatives, net	(160)	(1,185)
Fund Portfolio \| Fund IV \| Interest Rate Swaps \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Assets		(1,186)
Fund Portfolio \| Fund IV \| Interest Rate Swaps \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	$ (167)
Fund Portfolio \| Fund IV \| Interest Rate Swaps \| Minimum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2017-03
Derivative Maturity Date	2022-04
Fund Portfolio \| Fund IV \| Interest Rate Swaps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	1.48%
Fund Portfolio \| Fund IV \| Interest Rate Swaps \| Maximum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2019-12
Derivative Maturity Date	2022-12
Fund Portfolio \| Fund IV \| Interest Rate Swaps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	2.61%
Fund Portfolio \| Fund IV \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 71,338
Derivative Assets	$ 7	1
Fund Portfolio \| Fund IV \| Interest Rate Caps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2020-12
Derivative Maturity Date	2022-12
Strike Rate	3.00%
Fund Portfolio \| Fund IV \| Interest Rate Caps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2021-07
Derivative Maturity Date	2023-07
Strike Rate	3.50%
Fund Portfolio \| Fund V
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 297,731
Fair value, derivatives, net	(4,210)	(13,217)
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	$ (4,210)	$ (13,217)
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Minimum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2018-06
Derivative Maturity Date	2022-02
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	0.23%
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Maximum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2021-02
Derivative Maturity Date	2024-10
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	2.88%
Fund Portfolio \| Fund V \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 297,731