Name:	akr_FiniteLivedIntangibleAssetsAmortizationExpenseReductionOfRentExpenseNextTwelveMonths
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Finite-lived intangible assets, amortization expense, reduction of rent expense, year five.

No definition available.

Name:	akr_FiniteLivedIntangibleAssetsAmortizationExpenseReductionOfRentExpenseYearFive
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Finite-lived intangible assets, amortization expense, reduction of rent expense, year four.

No definition available.

Name:	akr_FiniteLivedIntangibleAssetsAmortizationExpenseReductionOfRentExpenseYearFour
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Data Type:	xbrli:monetaryItemType
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Finite-lived intangible assets, amortization expense, reduction of rent expense, year three.

No definition available.

Name:	akr_FiniteLivedIntangibleAssetsAmortizationExpenseReductionOfRentExpenseYearThree
Namespace Prefix:	akr_
Data Type:	xbrli:monetaryItemType
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Finite-lived intangible assets, amortization expense, reduction of rent expense, year two.

No definition available.

Name:	akr_FiniteLivedIntangibleAssetsAmortizationExpenseReductionOfRentExpenseYearTwo
Namespace Prefix:	akr_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths
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Data Type:	xbrli:monetaryItemType
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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearFive
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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearFour
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Data Type:	xbrli:monetaryItemType
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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_BelowMarketLeaseAmortizationIncomeYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

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

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).