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Goodwill and Other Intangible Assets - Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 402  
2018 1,424  
2019 1,167  
2020 918  
2021 697  
Thereafter 867  
Future Amortization Expense, Total $ 5,475 $ 6,776