Financial Instruments and Fair Value Measurements - Schedule of Items Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Impairment charges	$ 33,311	$ 9,925	$ 33,311	$ 9,925
Fair Value, Measurements, Nonrecurring
Derivatives, Fair Value [Line Items]
Impairment charges			33,311		$ 9,925
Fair Value, Measurements, Nonrecurring | Acadia Realty Trust
Derivatives, Fair Value [Line Items]
Impairment charges			$ 7,702		$ 2,294
146 Geary Street, San Francisco, CA | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event			Reduced projected operating income
Impairment charges			$ 12,435
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			$ 2,875
717 N. Michigan Avenue, Chicago, IL | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event			Reduced holding period and intended use
Impairment charges			$ 20,876
717 N. Michigan Avenue, Chicago, IL | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges			$ 4,827
27 E. 61st Street Manhattan, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event					Reduced projected operating income
Impairment charges					$ 6,909
27 E. 61st Street Manhattan, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges					$ 1,597
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Triggering Event					Reduced projected operating income
Impairment charges					$ 3,016
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections
Derivatives, Fair Value [Line Items]
Impairment charges					$ 697