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Investments - Schedule of Contractual Maturities of Long-Term Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Due after one year through five years $ 60,383 $ 54,959
Due after five years through six years 2,905 9,123
Total $ 63,288 $ 64,082