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Goodwill and Intangible Assets - Summary of Amortization expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 8,016  
2019 15,536  
2020 13,676  
2021 13,701  
2022 13,789  
Thereafter 26,074  
Net carrying Amount $ 90,792 $ 89,357