Interim Financial Data (Unaudited) - Summary of Interim Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Net sales	$ 164,772	$ 194,551	$ 206,453	$ 179,571	$ 139,971	$ 166,380	$ 206,692	$ 171,207	$ 745,347	$ 684,250	$ 565,153
Gross profit	71,263	82,431	83,444	69,365	59,856	67,210	91,115	76,713	306,503	294,894	243,373
Net income	$ 35,497	$ 41,976	$ 35,710	$ 31,555	$ 25,171	$ 29,471	$ 42,820	$ 37,110	$ 144,738	$ 134,572	$ 95,128
Basic net income per share	$ 0.61	$ 0.72	$ 0.61	$ 0.54	$ 0.43	$ 0.50	$ 0.73	$ 0.63	$ 2.48	$ 2.29	$ 1.62
Basic weighted average common shares outstanding	58,295,717	58,400,060	58,486,192	58,543,478	58,603,537	58,741,973	58,760,753	58,855,156	58,430,597	58,739,670	58,785,118
Diluted net income per share	$ 0.61	$ 0.72	$ 0.61	$ 0.54	$ 0.43	$ 0.50	$ 0.73	$ 0.63	$ 2.47	$ 2.28	$ 1.61
Diluted weighted average common shares outstanding	58,512,733	58,604,603	58,687,540	58,829,177	58,936,795	59,084,117	59,051,413	59,199,622	58,657,749	59,067,302	59,150,920