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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 3,463  
2020 3,294  
2021 2,852  
2022 1,211  
2023 934  
Thereafter 2,323  
Total $ 14,077 $ 17,051