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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Real Estate [Line Items]        
Impairment charges $ 12,570 $ 0 $ 37,210 $ 0
Fair Value, Measurements, Nonrecurring        
Real Estate [Line Items]        
Impairment charges     37,210  
Fair Value, Measurements, Nonrecurring | Acadia Realty Trust        
Real Estate [Line Items]        
Impairment charges     8,853  
IM (Fund III) | New York, NY | Fair Value, Measurements, Nonrecurring | Level 3 Inputs Projections        
Real Estate [Line Items]        
Impairment charges [1]     $ 7,240  
Triggering Event [1]     Reduced holding period  
IM (Fund III) | New York, NY | Fair Value, Measurements, Nonrecurring | Level 3 Inputs Projections | Acadia Realty Trust        
Real Estate [Line Items]        
Impairment charges [1]     $ 1,777  
IM (Fund III) | East Farmingdale, NY | Fair Value, Measurements, Nonrecurring | Level 3 Inputs Projections        
Real Estate [Line Items]        
Impairment charges [2]     $ 12,570  
Triggering Event [2]     Reduced holding period  
IM (Fund III) | East Farmingdale, NY | Fair Value, Measurements, Nonrecurring | Level 3 Inputs Projections | Acadia Realty Trust        
Real Estate [Line Items]        
Impairment charges [2]     $ 3,085  
IM (Fund IV) | New York, NY | Fair Value, Measurements, Nonrecurring | Level 3 Inputs Projections        
Real Estate [Line Items]        
Impairment charges [3]     $ 17,400  
Triggering Event [3]     Reduced holding period  
IM (Fund IV) | New York, NY | Fair Value, Measurements, Nonrecurring | Level 3 Inputs Projections | Acadia Realty Trust        
Real Estate [Line Items]        
Impairment charges [3]     $ 3,991  
[1] As of June 30, 2025, the fair value of the Fund III property was based on the purchase and sale agreement, excluding selling costs. This property was sold in the third quarter of 2025 (Note 2).
[2] As of September 30, 2025, the fair value of the Fund III property was estimated using a discounted cash flow model with a discount rate of 10.00% and a capitalization rate of 7.00%, resulting in a Level 3 fair value of $21.3 million as of the September 30, 2025 measurement date.
[3] As of June 30, 2025, the fair value of the Fund IV property was estimated using a discounted cash flow model with a discount rate of 9.25% and a capitalization rate of 8.25%, resulting in a Level 3 fair value of $28.6 million as of the June 30, 2025 measurement date.This property was sold in October 2025.