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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 Remaining $ 1,653  
2020 3,300  
2021 2,852  
2022 1,251  
2023 954  
2024 872  
Thereafter 1,457  
Total $ 12,339 $ 14,077