Quarterly Financial Information (Unaudited) (Summary of Quarterly Financial Results) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 131,398	$ 131,240	$ 134,561	$ 127,306	$ 127,583	$ 134,227	$ 148,793	$ 125,226	$ 524,505	$ 535,829	$ 397,969
Gross profit	29,217	31,691	33,889	27,700	25,562	28,564	34,653	26,199	122,497	114,978	85,225
Net income	$ 5,319	$ 11,186	$ 10,817	$ 18,937	$ 5,733	$ 4,158	$ 8,240	$ 3,716	$ 46,259	$ 21,847	$ 19,155
Earnings per common share:
Basic (in USD per share)	$ 0.32	$ 0.67	$ 0.65	$ 1.12	$ 0.34	$ 0.25	$ 0.50	$ 0.22	$ 2.76	$ 1.31	$ 1.16
Diluted (in USD per share)	$ 0.31	$ 0.66	$ 0.64	$ 1.11	$ 0.34	$ 0.24	$ 0.49	$ 0.22	$ 2.71	$ 1.28	$ 1.14