Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ (1,171)	$ (46)
Derivative Asset	35,867	54,902
Core Portfolio
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	806,000
Fair value, derivatives, net	24,838	40,838
Core Portfolio \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ (1,171)	$ (46)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Unconsolidated VIE liabilities	Unconsolidated VIE liabilities
Derivative Asset	$ 26,009	$ 40,884
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total assets	Total assets
Core Portfolio \| Interest Rate Swaps \| Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 50,000
Core Portfolio \| Interest Rate Swaps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 756,000
Core Portfolio \| Interest Rate Swaps \| Minimum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2022-12
Derivative Maturity Date	2028-04
Strike Rate	3.35%
Core Portfolio \| Interest Rate Swaps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2015-03
Derivative Maturity Date	2023-03
Strike Rate	2.10%
Core Portfolio \| Interest Rate Swaps \| Maximum \| Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2023-04
Derivative Maturity Date	2029-12
Strike Rate	3.61%
Core Portfolio \| Interest Rate Swaps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2023-01
Derivative Maturity Date	2030-07
Strike Rate	3.05%
Fund Portfolio \| Fund II \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 53	$ 1,108
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total assets	Total assets
Fund Portfolio \| Fund II \| Interest Rate Swaps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 50,000
Derivative Effective Date	2023-01
Derivative Maturity Date	2029-12
Fund Portfolio \| Fund II \| Interest Rate Swaps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.23%
Fund Portfolio \| Fund II \| Interest Rate Swaps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.23%
Fund Portfolio \| Fund III \| Interest Rate Caps
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 137	$ 232
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total assets	Total assets
Fund Portfolio \| Fund III \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 35,970
Derivative Effective Date	2022-07
Derivative Maturity Date	2023-07
Fund Portfolio \| Fund III \| Interest Rate Caps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.50%
Fund Portfolio \| Fund III \| Interest Rate Caps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.50%
Fund Portfolio \| Fund IV \| Interest Rate Caps
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 793	$ 1,093
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total assets	Total assets
Fund Portfolio \| Fund IV \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 76,338
Fund Portfolio \| Fund IV \| Interest Rate Caps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2021-07
Derivative Maturity Date	2023-07
Strike Rate	3.00%
Fund Portfolio \| Fund IV \| Interest Rate Caps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2022-12
Derivative Maturity Date	2023-12
Strike Rate	3.50%
Fund Portfolio \| Fund V
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 342,124
Fair value, derivatives, net	8,875	$ 11,585
Fund Portfolio \| Fund V \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 8,490	$ 11,585
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total assets	Total assets
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 301,459
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2019-11
Derivative Maturity Date	2023-06
Strike Rate	1.14%
Fund Portfolio \| Fund V \| Interest Rate Swaps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2023-01
Derivative Maturity Date	2027-12
Strike Rate	3.36%
Fund Portfolio \| Fund V \| Interest Rate Caps
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 385	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total assets	Total assets
Fund Portfolio \| Fund V \| Interest Rate Caps \| Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 40,665
Derivative Effective Date	2023-01
Derivative Maturity Date	2024-01
Fund Portfolio \| Fund V \| Interest Rate Caps \| Minimum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.64%
Fund Portfolio \| Fund V \| Interest Rate Caps \| Maximum \| Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.64%

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

Indicates line item in statement of financial position that includes derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

+ Details

Name:	us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

- 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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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

Indicates line item in statement of financial position that includes derivative liability.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
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 https://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 https://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_StatementBusinessSegmentsAxis=akr_CorePortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
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:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
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_FundIIIMember
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:	srt_ConsolidatedEntitiesAxis=akr_FundIVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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