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Contractual Maturities of Investments Held (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities  
Due within one year, cost $ 478,306
Due after 1 year through 5 years, cost 209,822
Due after 5 years through 10 years, cost 5,183
Due after 10 years, cost 39,191
Total, cost 732,502
Due within one year, fair value 477,696
Due after 1 year through 5 years, fair value 209,314
Due after 5 years through 10 years, fair value 5,179
Due after 10 years, fair value 37,481
Total, fair value $ 729,670