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Revenue - Impact of Adoption on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Accounts receivable, net	$ 80,656		$ 67,287
Inventories	92,035		98,119
Prepaid expenses and other current assets	6,621		$ 6,463
ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivable, net		$ 68,734
Prepaid expenses and other current assets		5,987
Balance Without ASC 606 Adoption [Member] \| ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivable, net	78,142
Inventories	92,126
Prepaid expenses and other current assets	7,514
Adjustments Due to ASC 606 [Member] \| ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivable, net	2,514	1,447
Inventories	(91)
Prepaid expenses and other current assets	$ (893)	$ (476)