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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]      
2018 remaining $ 3,116    
2019 11,010    
2020 8,672    
2021 6,417    
2022 4,595    
Thereafter 8,324    
Net Carrying Amount $ 42,134 $ 53,096 $ 29,235