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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
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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-Topic 320
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