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Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 5,332  
2020 4,450  
2021 4,101  
2022 3,477  
2023 3,325  
Thereafter 12,498  
Net Value $ 33,183 $ 4,661