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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]      
2019 remaining $ 12,439    
2020 14,091    
2021 11,336    
2022 9,014    
2023 7,053    
Thereafter 18,611    
Net Carrying Amount $ 72,544 $ 77,016 $ 48,833