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Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 2,867  
2018 1,168  
2019 655  
2020 621  
2021 568  
Thereafter 1,388  
Net Value $ 7,267 $ 5,083