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Investments - Schedule of Equity Securities and Trading Debt Securities Net Unrealized Investment Gains and Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Net Realized Or Unrealized Gain Loss On Trading Securities [Abstract] |  |
Net unrealized investment gains (losses) | $ 24,787 | $ (40,867)

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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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