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Schedule of Investments in Equity Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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

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