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Goodwill and Intangibles - Schedule of Estimated Amortization Expense of Intangibles (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 2,986  
2019 2,918  
2020 2,722  
2021 2,396  
2022 2,334  
Thereafter 9,081  
Net Intangible Assets $ 22,437 $ 23,708