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Intangible Assets - Estimated Amortization Expense Succeeding Fiscal Years (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 3,076  
2017 2,701  
2018 2,185  
2019 2,017  
2020 1,691  
Thereafter 1,519  
Net Carrying Value $ 13,189 $ 8,312