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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 436,404	$ 250,208
Debt and equity securities, Amortized Cost	436,036	250,182
Debt and equity securities, Unrealized Gains	476	166
Debt and equity securities, Unrealized Losses	(108)	(140)
Debt and equity securities, Estimated Fair Value	436,404	250,208
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	245,584	75,315
Debt securities, Unrealized Gains	319	47
Debt securities, Unrealized Losses	0	(28)
Debt securities, Estimated Fair Value	245,903	75,334
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	190,452	174,867
Debt securities, Unrealized Gains	157	119
Debt securities, Unrealized Losses	(108)	(112)
Debt securities, Estimated Fair Value	$ 190,501	$ 174,874

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