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Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 859  
2019 3,540  
2020 2,657  
2021 2,364  
2022 2,350  
Thereafter 12,484  
Net Value $ 24,254 $ 4,661