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Schedule of Investments in Equity Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value $ 16,954 $ 17,520
Common Stock    
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value 1,189 1,271
Preferred Stock    
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value $ 15,765 $ 16,249