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Goodwill and Intangible Assets - Total Estimated Annual Future Amortization Expense for the Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 6,134  
2020 3,847  
2021 3,389  
2022 2,116  
2023 1,495  
Thereafter 939  
Total $ 17,920 $ 24,454