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Goodwill and Intangible Assets - Summary of Estimated Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
Year ending December 31, 2019 (remainder) $ 5,653  
Year ending December 31, 2020 18,822  
Year ending December 31, 2021 12,322  
Year ending December 31, 2022 10,984  
Year ending December 31, 2023 10,812  
Thereafter 44,322  
Total $ 102,915 $ 4,951