Interim Financial Data (Unaudited) - Summary of Interim Financial Data (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 Data [Abstract]
Net sales	$ 89,202	$ 94,023	$ 136,779	$ 120,800	$ 74,202	$ 95,502	$ 121,311	$ 100,645	$ 440,804	$ 391,660	$ 342,511
Gross profit	31,955	22,143	52,524	48,247	26,635	30,369	45,026	38,167	154,869	140,196	98,618
Net income	$ 8,086	$ 3,744	$ 18,715	$ 17,553	$ 5,153	$ 8,913	$ 15,161	$ 12,295	$ 48,098	$ 41,521	$ 34,598
Basic net income per share	$ 0.26	$ 0.12	$ 0.59	$ 0.55	$ 0.16	$ 0.28	$ 0.46	$ 0.37	$ 1.53	$ 1.28	$ 1.03
Basic weighted average common shares outstanding	30,766,943	31,227,643	31,735,333	31,683,672	31,641,963	31,606,264	32,898,288	33,128,676	31,350,542	32,319,649	33,589,682
Diluted net income per share	$ 0.26	$ 0.12	$ 0.58	$ 0.55	$ 0.16	$ 0.28	$ 0.46	$ 0.37	$ 1.52	$ 1.27	$ 1.01
Diluted weighted average common shares outstanding	30,966,682	31,537,010	32,142,939	32,094,828	32,085,210	32,008,781	33,307,463	33,599,438	31,682,509	32,751,074	34,273,502