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Contractual Maturities of Investments Held (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 1,349,970
Due after 1 year through 5 years, cost	48,796
Due after 5 years through 10 years, cost	13,916
Due after 10 years, cost	38,644
Total, cost	1,451,326
Due within one year, fair value	1,347,979
Due after 1 year through 5 years, fair value	48,599
Due after 5 years through 10 years, fair value	13,489
Due after 10 years, fair value	40,408
Total, fair value	$ 1,450,475

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