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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 410,181	$ 250,208
Debt and equity securities, Amortized Cost	409,297	250,182
Debt and equity securities, Unrealized Gains	912	166
Debt and equity securities, Unrealized Losses	(28)	(140)
Debt and equity securities, Estimated Fair Value	410,181	250,208
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	240,310	75,315
Debt securities, Unrealized Gains	562	47
Debt securities, Unrealized Losses	(1)	(28)
Debt securities, Estimated Fair Value	240,871	75,334
Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	168,987	174,867
Debt securities, Unrealized Gains	350	119
Debt securities, Unrealized Losses	(27)	(112)
Debt securities, Estimated Fair Value	$ 169,310	$ 174,874

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