Quarterly Financial Information (Unaudited) (Summary of Quarterly Financial 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]
Net sales	$ 144,192	$ 155,725	$ 137,235	$ 129,700	$ 131,398	$ 131,240	$ 134,561	$ 127,306	$ 566,852	$ 524,505	$ 535,829
Gross profit	31,982	38,193	35,990	32,377	29,217	31,691	33,889	27,700	138,542	122,497	114,978
Net income	$ 4,420	$ 12,785	$ 10,813	$ 9,169	$ 5,319	$ 11,186	$ 10,817	$ 18,937	$ 37,187	$ 46,259	$ 21,847
Earnings per common share:
Basic (in dollars per share)	$ 0.26	$ 0.76	$ 0.64	$ 0.54	$ 0.32	$ 0.67	$ 0.65	$ 1.12	$ 2.20	$ 2.76	$ 1.31
Diluted (in dollars per share)	$ 0.26	$ 0.75	$ 0.63	$ 0.54	$ 0.31	$ 0.66	$ 0.64	$ 1.11	$ 2.16	$ 2.71	$ 1.28