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Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 421,024
Due after 1 year through 5 years, cost	9,325
Due after 5 years through 10 years, cost	14,026
Due after 10 years, cost	39,873
Total, cost	484,248
Due within one year, fair market value	421,088
Due after 1 year through 5 years, fair market value	9,343
Due after 5 years through 10 years, fair market value	13,659
Due after 10 years, fair maket value	40,304
Total, fair market value	$ 484,394

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