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Schedule of Expected Future Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2018 (remaining) $ 1,603  
2019 6,304  
2020 5,143  
2021 4,907  
2022 4,606  
Thereafter 34,601  
Net Carrying Amount $ 57,164 $ 62,024