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Investments - Schedule of Equity Securities and Trading Debt Securities Net Unrealized Investment Gains and Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net Realized Or Unrealized Gain Loss On Trading Securities [Abstract] |  |  |
Net unrealized investment gains (losses) | $ (92,793) | $ 14,154 | $ 49,719

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- Definition Amount of net unrealized gain (loss) on investments in equity securities and trading debt securities. + References No definition available. + Details
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