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Schedule of Investments in Equity Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value $ 17,520 $ 99,978
Common Stock    
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value 1,271 75,987
Preferred Stock    
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value $ 16,249 $ 23,991