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Intangible Assets - Schedule of Finite Lived Intangible Assets Future Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Patents [Member]  
Acquired Indefinite Lived Intangible Assets [Line Items]  
2018 $ 18,663
2019 13,922
2020 10,399
2021 9,661
2022 9,493
Finite Lived Intangible Assets Net 62,138
Acquired Developed Software Customer Relationships Brand And Backlog [Member]  
Acquired Indefinite Lived Intangible Assets [Line Items]  
2018 6,924
2019 6,924
2020 6,924
2021 6,924
2022 4,683
Finite Lived Intangible Assets Net $ 32,379