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Investments - Schedule of Contractual Maturities of Long-Term Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Due after one year through five years $ 69,699 $ 78,561
Due after five years through six years   2,121
Total $ 69,699 $ 80,682