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Financial Instruments and Fair Value Measurements - Schedule of Items Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Impairment charges	$ 0			$ 1,400	$ 51,549	$ 1,400
Fair Value, Measurements, Nonrecurring
Derivatives, Fair Value [Line Items]
Impairment charges		$ 51,549					$ 1,721
Fair Value, Measurements, Nonrecurring | Acadia Realty Trust
Derivatives, Fair Value [Line Items]
Impairment charges		$ 12,400					$ 395
Cortlandt Crossing, Mohegan Lake, NY | Fair Value, Measurements, Nonrecurring | Fund III | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event		Reduced holding period, reduced projected operating income
Impairment charges		$ 27,402
Cortlandt Crossing, Mohegan Lake, NY | Fair Value, Measurements, Nonrecurring | Fund III | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges		$ 6,726
654 Broadway, New York, NY | Fair Value, Measurements, Nonrecurring | Fund III | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event		Reduced holding period
Impairment charges		$ 6,398
654 Broadway, New York, NY | Fair Value, Measurements, Nonrecurring | Fund III | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges		$ 1,570
146 Geary Street, San Francisco, CA | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event		Reduced holding period, reduced projected operating income
Impairment charges		$ 6,718
146 Geary Street, San Francisco, CA | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges		$ 1,553
801 Madison Avenue, New York, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event		Reduced holding period, reduced projected operating income
Impairment charges		$ 11,031
801 Madison Avenue, New York, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges		$ 2,551
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Contract Sales Price
Derivatives, Fair Value [Line Items]
Triggering Event			Reduced selling price
Impairment charges			$ 321
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Offering Price
Derivatives, Fair Value [Line Items]
Triggering Event				Reduced selling price
Impairment charges				$ 1,400
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Contract Sales Price
Derivatives, Fair Value [Line Items]
Impairment charges			$ 74
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Offering Price
Derivatives, Fair Value [Line Items]
Impairment charges				$ 321

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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