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Intangible Assets - Estimated Amortization Expense Succeeding Fiscal Years (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 2,701  
2020 2,185  
2021 2,017  
2022 1,691  
2023 989  
Thereafter 530  
Net Carrying Value $ 10,113 $ 13,189