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Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 1,212  
2019 697  
2020 659  
2021 603  
2022 567  
Thereafter 923  
Net Value $ 4,661 $ 7,267