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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 3,271  
2019 13,083  
2020 12,331  
2021 9,190  
2022 8,009  
2023 and thereafter 20,181  
Total $ 66,065 $ 74,354