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Goodwill and Intangible Assets - Estimated Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 2,012  
2019 1,787  
2020 1,481  
2021 1,394  
2022 1,375  
Thereafter 4,353  
Estimated amortization $ 12,402 $ 9,366