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Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 399,852
Due after 1 year through 5 years, cost	12,304
Due after 5 years through 10 years, cost	14,101
Due after 10 years, cost	40,060
Total, cost	466,317
Due within one year, fair market value	400,227
Due after 1 year through 5 years, fair market value	12,411
Due after 5 years through 10 years, fair market value	14,156
Due after 10 years, fair maket value	42,818
Total, fair market value	$ 469,612

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