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Goodwill and Intangible Assets - Estimated Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2017 $ 1,425  
2018 1,422  
2019 1,280  
2020 984  
2021 910  
Thereafter 3,345  
Estimated amortization $ 9,366 $ 7,371