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Goodwill and Other Intangible Assets - Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 537  
2020 919  
2021 697  
2022 481  
2023 283  
Thereafter 102  
Future Amortization Expense, Total $ 3,019 $ 3,649