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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 3,640  
2018 14,307  
2019 14,042  
2020 13,387  
2021 10,204  
2022 and thereafter 35,974  
Net intangible assets $ 91,554 $ 98,531