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Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 522,228
Due after 1 year through 5 years, cost	24,829
Due after 5 years through 10 years, cost	13,030
Due after 10 years, cost	33,476
Total, cost	593,563
Due within one year, fair market value	522,280
Due after 1 year through 5 years, fair market value	25,245
Due after 5 years through 10 years, fair market value	14,183
Due after 10 years, fair maket value	40,567
Total, fair market value	$ 602,275

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