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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 508,359	$ 436,404
Debt and equity securities, Amortized Cost	507,897	436,036
Debt and equity securities, Unrealized Gains	579	476
Debt and equity securities, Unrealized Losses	(117)	(108)
Debt and equity securities, Estimated Fair Value	508,359	436,404
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	364,223	245,584
Debt securities, Unrealized Gains	552	319
Debt securities, Unrealized Losses	(23)	0
Debt securities, Estimated Fair Value	364,752	245,903
Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	143,674	190,452
Debt securities, Unrealized Gains	27	157
Debt securities, Unrealized Losses	(94)	(108)
Debt securities, Estimated Fair Value	$ 143,607	$ 190,501

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