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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 9,561  
2019 12,751  
2020 12,107  
2021 8,892  
2022 7,999  
2023 and thereafter 20,172  
Net intangible assets $ 71,482 $ 74,354