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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 3,316  
2021 2,868  
2022 1,266  
2023 971  
2024 887  
Thereafter 1,721  
Total $ 11,029 $ 14,077