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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 64,252
Due after one year through five years	528,033
Due after five years through ten years	512,416
Due after ten years	31,245
Perpetual maturity securities	2,244
Amortized Cost	1,138,190	$ 1,061,192
Fair Value
Due in one year or less	63,354
Due after one year through five years	486,015
Due after five years through ten years	444,405
Due after ten years	25,421
Perpetual maturity securities	1,811
Fair Value	$ 1,021,006	$ 1,040,455

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