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Goodwill and Intangible Assets - Summary of Amortization expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 4,146  
2020 14,968  
2021 15,053  
2022 15,280  
2023 15,185  
Thereafter 16,343  
Net carrying Amount $ 80,975 $ 88,030