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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 410,181 | $ 250,208
Debt and equity securities, Amortized Cost | 409,297 | 250,182
Debt and equity securities, Unrealized Gains | 912 | 166
Debt and equity securities, Unrealized Losses | (28) | (140)
Debt and equity securities, Estimated Fair Value | 410,181 | 250,208
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 240,310 | 75,315
Debt securities, Unrealized Gains | 562 | 47
Debt securities, Unrealized Losses | (1) | (28)
Debt securities, Estimated Fair Value | 240,871 | 75,334
Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 168,987 | 174,867
Debt securities, Unrealized Gains | 350 | 119
Debt securities, Unrealized Losses | (27) | (112)
Debt securities, Estimated Fair Value | $ 169,310 | $ 174,874

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