Summarized Quarterly Financial Data (Unaudited) - Quarterly Operating Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 162,986	$ 168,890	$ 162,701	$ 142,204	$ 139,013	$ 158,078	$ 160,138	$ 142,835	$ 636,781	$ 600,064	$ 630,007
Gross profit	70,787	75,808	78,955	65,794	62,439	70,649	68,246	65,563	291,344	266,897	311,327
Operating income	4,272	10,130	14,812	5,521	2,800	8,072	644	1,963	34,735	13,479	47,111
Net Income	$ 7,572	$ 12,415	$ 10,228	$ 5,014	$ 5,718	$ 7,067	$ 2,544	$ 3,317	$ 35,229	$ 18,646	$ 44,620
Earnings per common share – basic	$ 0.16	$ 0.26	$ 0.21	$ 0.10	$ 0.12	$ 0.14	$ 0.05	$ 0.06	$ 0.72	$ 0.36	$ 0.81
Earnings per common share – diluted	$ 0.16	$ 0.26	$ 0.21	$ 0.10	$ 0.12	$ 0.14	$ 0.05	$ 0.06	$ 0.72	$ 0.36	$ 0.80