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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 14,236  
2019 14,307  
2020 13,664  
2021 10,500  
2022 9,661  
2023 and thereafter 27,339  
Net intangible assets $ 89,707 $ 98,531