Quarterly report pursuant to Section 13 or 15(d)

Investments - Additional Information (Detail)

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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Greater Than 10% of Total Assets        
Schedule of Equity Method Investments [Line Items]        
Investment income     $ 0  
Bridge Multifamily Fund III [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of investments in funds 12.00%   12.00%  
Bridge Multifamily Fund III [Member] | Bridge Investment Group Holdings Llc        
Schedule of Equity Method Investments [Line Items]        
Investment income $ 3,103 $ 441 $ 12,723 $ 220
Bridge Multifamily Fund IV [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of investments in funds 16.00%   16.00%  
Bridge Multifamily Fund IV [Member] | Bridge Investment Group Holdings Llc        
Schedule of Equity Method Investments [Line Items]        
Investment income $ 12,829 $ 9,799 $ 35,436 $ 10,379