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Investments - Schedule of Contractual Maturities of Long-Term Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Due after one year through five years $ 70,005 $ 60,383
Due after five years through seven years 8,970 2,905
Total $ 78,975 $ 63,288