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Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 39,950
Due after 1 year through 5 years, cost	33,045
Due after 5 years through 10 years, cost	4,782
Due after 10 years, cost	39,065
Total, cost	116,842
Due within one year, fair market value	39,612
Due after 1 year through 5 years, fair market value	31,466
Due after 5 years through 10 years, fair market value	4,232
Due after 10 years, fair maket value	30,981
Total, fair market value	$ 106,291

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