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Summary of Gross Unrealized Losses and Fair Values on Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Less than 12 months, Fair value $ 7,030 $ 32,695
Available-for-sale securities- matures within one year, Gross unrealized losses (60) (389)
12 months or greater, Fair value 15,970 14,488
Available-for-sale securities- matures after one year through three years, Gross unrealized losses $ (107) $ (105)