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Quarterly Financial Information - Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Net sales	$ 96,892	$ 99,239	$ 97,512	$ 84,569	$ 86,433	$ 88,299	$ 83,220	$ 78,682	$ 378,212	$ 336,634	$ 354,666
Gross profit	30,755	33,535	29,673	24,665	29,464	28,855	26,806	24,289	118,628	109,414	103,452
Income before income taxes	7,691	9,739	6,258	2,118	6,990	6,534	3,773	3,656	25,806	20,953	11,706
Net income	$ 702	$ 6,278	$ 4,156	$ 1,518	$ 5,100	$ 4,742	$ 2,755	$ 2,658	$ 12,654	$ 15,255	$ 6,675
Net income, basic	$ 0.14	$ 1.23	$ 0.81	$ 0.30	$ 1.00	$ 0.92	$ 0.53	$ 0.51	$ 2.48	$ 2.95	$ 1.25
Net income, diluted	$ 0.14	$ 1.23	$ 0.81	$ 0.30	$ 0.99	$ 0.92	$ 0.53	$ 0.51	$ 2.47	$ 2.95	$ 1.24

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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