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Investments - Investments Classified as Long-Term Available-for-Sale Investments and Long-Term Cost Method Investments (Parenthetical) (Detail) - Minority Interest in Private Company [Member] - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 27, 2016
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2016
Schedule of Cost-method Investments [Line Items]        
Investments in minority interest $ 9,300 $ 9,300    
Impairment charges     $ 5,000 $ 5,000