Interim Financial Data (Unaudited) - Summary of Interim Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data [Abstract]
Net sales	$ 139,971	$ 166,380	$ 206,692	$ 171,207	$ 122,212	$ 140,194	$ 157,941	$ 144,806	$ 684,250	$ 565,153	$ 479,616
Gross profit	59,856	67,210	91,115	76,713	50,906	55,284	72,014	65,169	294,894	243,373	187,095
Net income	$ 25,171	$ 29,471	$ 42,820	$ 37,110	$ 18,299	$ 20,098	$ 28,782	$ 27,949	$ 134,572	$ 95,128	$ 67,847
Basic net income per share	$ 0.43	$ 0.50	$ 0.73	$ 0.63	$ 0.31	$ 0.34	$ 0.49	$ 0.48	$ 2.29	$ 1.62	$ 1.16
Basic weighted average common shares outstanding	58,603,537	58,741,973	58,760,753	58,855,156	58,825,696	58,808,098	58,778,916	58,726,420	58,739,670	58,785,118	58,789,118
Diluted net income per share	$ 0.43	$ 0.50	$ 0.73	$ 0.63	$ 0.31	$ 0.34	$ 0.49	$ 0.48	$ 2.28	$ 1.61	$ 1.15
Diluted weighted average common shares outstanding	58,936,795	59,084,117	59,051,413	59,199,622	59,222,258	59,156,432	59,100,836	59,122,812	59,067,302	59,150,920	59,225,338