Accounts Receivable and Sales Concentrations - Summary of Accounts Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Trade	$ 132,910	$ 135,260
Less—allowance for doubtful accounts	1,352	1,839	$ 1,719	$ 1,069
Accounts receivable, net	$ 131,558	$ 133,421