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Intangible Assets - Estimated Amortization Expense Succeeding Fiscal Years (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 2,311  
2017 1,770  
2018 1,395  
2019 971  
2020 794  
Thereafter 1,071  
Net Carrying Value $ 8,312 $ 6,315