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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 463,881 | $ 436,404
Debt and equity securities, Amortized Cost | 463,365 | 436,036
Debt and equity securities, Unrealized Gains | 575 | 476
Debt and equity securities, Unrealized Losses | (59) | (108)
Debt and equity securities, Estimated Fair Value | 463,881 | 436,404
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 279,796 | 245,584
Debt securities, Unrealized Gains | 510 | 319
Debt securities, Unrealized Losses | 0 | 0
Debt securities, Estimated Fair Value | 280,306 | 245,903
Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 183,569 | 190,452
Debt securities, Unrealized Gains | 65 | 157
Debt securities, Unrealized Losses | (59) | (108)
Debt securities, Estimated Fair Value | $ 183,575 | $ 190,501

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