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Summarized Quarterly Financial Data (Unaudited) - Quarterly Operating Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 140,088	$ 140,335	$ 128,048	$ 120,806	$ 126,836	$ 185,112	$ 184,673	$ 170,279	$ 529,277	$ 666,900	$ 636,781
Gross profit	55,388	58,448	49,996	39,733	58,809	86,491	84,626	73,709	203,565	303,635	291,330
Operating income (loss)	(3,783)	(2,179)	(12,813)	(26,647)	(4,153)	18,227	16,363	6,949	(45,422)	37,386	34,573
Net income (loss)	$ (8,447)	$ 7,589	$ (7,670)	$ (10,814)	$ (11,110)	$ 15,898	$ 12,401	$ 6,651	$ (19,342)	$ 23,840	$ 35,229
Earnings (loss) per common share - basic	$ (0.18)	$ 0.16	$ (0.16)	$ (0.22)	$ (0.23)	$ 0.33	$ 0.26	$ 0.14	$ (0.40)	$ 0.50	$ 0.72
Earnings (loss) per common share – diluted	$ (0.18)	$ 0.16	$ (0.16)	$ (0.22)	$ (0.23)	$ 0.33	$ 0.26	$ 0.14	$ (0.40)	$ 0.49	$ 0.72

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