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Contractual Maturities of Investments in Debt Securities Held (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Schedule of Available-for-sale Securities  
Due within one year, cost $ 190,100
Due after 1 year through 5 years, cost 9,199
Due after 5 years through 10 years, cost 14,081
Due after 10 years, cost 42,478
Total, cost 255,858
Due within one year, fair market value 190,096
Due after 1 year through 5 years, fair market value 9,144
Due after 5 years through 10 years, fair market value 13,405
Due after 10 years, fair maket value 40,804
Total, fair market value $ 253,449