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Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Dec. 31, 2024 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 46,349
Due after 1 year through 5 years, cost	25,554
Due after 5 years through 10 years, cost	8,648
Due after 10 years, cost	36,151
Total, cost	116,702
Due within one year, fair market value	46,312
Due after 1 year through 5 years, fair market value	25,316
Due after 5 years through 10 years, fair market value	8,232
Due after 10 years, fair maket value	27,210
Total, fair market value	$ 107,070

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