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Accounts Receivable, Net - Summary of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Accounts receivable $ 151,676 $ 119,333  
Less: Allowance for doubtful accounts (3,049) (3,855) $ (2,735)
Accounts receivable, net $ 148,627 $ 115,478