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Contractual Maturities of Investments Held (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 871,321
Due after 1 year through 5 years, cost	365,873
Due after 5 years through 10 years, cost	12,839
Due after 10 years, cost	38,173
Total, cost	1,288,206
Due within one year, fair value	871,024
Due after 1 year through 5 years, fair value	365,451
Due after 5 years through 10 years, fair value	12,309
Due after 10 years, fair value	37,912
Total, fair value	$ 1,286,696

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