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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 Remaining $ 2,501  
2020 3,293  
2021 2,846  
2022 1,244  
2023 946  
2024 862  
Thereafter 1,455  
Total $ 13,147 $ 14,077