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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 126,836	$ 185,112	$ 184,673	$ 170,279	$ 162,986	$ 168,890	$ 162,701	$ 142,204	$ 666,900	$ 636,781	$ 600,064
Gross profit	58,815	86,498	84,632	73,715	70,787	75,808	78,955	65,794	303,660	291,344	266,897
Operating income	(4,061)	18,318	16,448	7,032	4,272	10,130	14,812	5,521	37,737	34,735	13,479
Net Income	$ (11,110)	$ 15,898	$ 12,401	$ 6,651	$ 7,572	$ 12,415	$ 10,228	$ 5,014	$ 23,840	$ 35,229	$ 18,646
Earnings per common share – basic	$ (0.23)	$ 0.33	$ 0.26	$ 0.14	$ 0.16	$ 0.26	$ 0.21	$ 0.10	$ 0.50	$ 0.72	$ 0.36
Earnings per common share – diluted	$ (0.23)	$ 0.33	$ 0.26	$ 0.14	$ 0.16	$ 0.26	$ 0.21	$ 0.10	$ 0.49	$ 0.72	$ 0.36

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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