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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 102,455
Due after one year through five years	558,902
Due after five years through ten years	457,242
Due after ten years	23,977
Perpetual maturity securities	3,802
Amortized Cost	1,146,378	$ 1,152,852
Fair Value
Due in one year or less	100,102
Due after one year through five years	512,244
Due after five years through ten years	391,643
Due after ten years	19,370
Perpetual maturity securities	3,196
Fair Value	$ 1,026,555	$ 1,014,626

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