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Goodwill and Intangible Assets - Summary of Estimated Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
Year ending December 31, 2019 (remainder) $ 11,315  
Year ending December 31, 2020 18,839  
Year ending December 31, 2021 12,339  
Year ending December 31, 2022 11,000  
Year ending December 31, 2023 10,827  
Thereafter 44,341  
Total $ 108,661 $ 4,951