Financial Instruments and Fair Value Measurements - Schedule of Items Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Real Estate [Line Items]
Impairment charges		$ 1,678	$ 3,686	$ 33,311
Fair Value, Measurements, Nonrecurring
Real Estate [Line Items]
Impairment charges	[1],[2]	1,678
Fair Value, Measurements, Nonrecurring | Acadia Realty Trust
Real Estate [Line Items]
Impairment charges	[1],[2]	$ 750
Fair Value, Measurements, Nonrecurring | 1964 Union Street San Francisco, CA | Fund IV | Level 3 Inputs Projections
Real Estate [Line Items]
Triggering Event		Reduced holding period
Impairment charges	[2]	$ 1,170
Fair Value, Measurements, Nonrecurring | 1964 Union Street San Francisco, CA | Acadia Realty Trust | Fund IV | Level 3 Inputs Projections
Real Estate [Line Items]
Impairment charges	[2]	$ 242
Fair Value, Measurements, Nonrecurring | Mark Plaza Edwardsville, PA | Core | Level 3 Inputs Projections
Real Estate [Line Items]
Triggering Event		Reduced projected operating income
Impairment charges	[2]	$ 508
Fair Value, Measurements, Nonrecurring | Mark Plaza Edwardsville, PA | Acadia Realty Trust | Core | Level 3 Inputs Projections
Real Estate [Line Items]
Impairment charges	[2]	$ 508
Fair Value, Measurements, Nonrecurring | 146 Geary Street, San Francisco, CA | Fund IV | Level 3 Inputs Projections
Real Estate [Line Items]
Triggering Event			Reduced holding period
Impairment charges	[2]		$ 3,686
Fair Value, Measurements, Nonrecurring | 146 Geary Street, San Francisco, CA | Acadia Realty Trust | Fund IV | Level 3 Inputs Projections
Real Estate [Line Items]
Impairment charges	[2]		$ 852

[1] Does not include the impairment charge of $0.4 million related to the Company’s investment in Fifth Wall (Note 4) which is recorded in Realized and unrealized holding (losses) gains on investments and other, in the Company’s consolidated Statement of Operations.

[2] The Company estimated the fair value of 1964 Union Street, Mark Plaza and 146 Geary Street based on a discounted cash flow analysis using a discount rate of 7.75% and a range of capitalization rates from 4.75% to 5.75%. As significant inputs to the models are unobservable, the Company determined that the value determined for these properties falls within Level 3 of the fair value reporting hierarchy.