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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Net Realized Or Unrealized Gain Loss On Trading Securities [Abstract] |  |  |  |
Net unrealized investment gains (losses) | $ (62,131) | $ 18,637 | $ (102,998) | $ 19,691

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