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Goodwill and Other Intangible Assets - Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 331  
2019 1,167  
2020 918  
2021 697  
2022 481  
Thereafter 386  
Future Amortization Expense, Total $ 3,980 $ 5,073