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Accounts Receivable, Net - Activity in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Allowance for doubtful accounts - beginning $ 3,855 $ 2,735
Charged to costs and other 1,908 5,457
Write offs (2,714) (4,337)
Allowance for doubtful accounts - ending $ 3,049 $ 3,855