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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

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