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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 16,929  
2020 14,091  
2021 11,336  
2022 9,014  
2023 7,053  
Thereafter 18,593  
Net Carrying Amount $ 77,016 $ 53,096