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Real Estate - Real Estate Under Development and Construction in Progress - Additional Information (Details) - property	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Number of projects put into service during period	0
Number of unconsolidated project in development			1
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of projects put into service during period		1

X

- Definition

Number of real estate projects put into service during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	akr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of unconsolidated real estate project in development.

+ References

No definition available.

+ Details

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Namespace Prefix:	akr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- 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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: