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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 110,996 |
Due after one year through five years | 745,807 |
Due after five years through ten years | 427,102 |
Due after ten years | 29,012 |
Perpetual maturity securities | 3,502 |
Amortized Cost | 1,316,419 | $ 1,162,919
Fair Value |  |
Due in one year or less | 109,281 |
Due after one year through five years | 707,068 |
Due after five years through ten years | 371,633 |
Due after ten years | 24,332 |
Perpetual maturity securities | 3,316 |
Fair Value | $ 1,215,630 | $ 1,064,330

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