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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, 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
Selected Quarterly Financial Information [Abstract]                      
Net sales $ 113,649 $ 119,217 $ 114,842 $ 97,153 $ 105,411 $ 108,413 $ 108,915 $ 98,139 $ 444,861 $ 420,878 $ 378,212
Gross profit 36,180 39,343 37,807 27,265 32,019 33,491 35,203 31,518 140,595 132,231 118,628
Income before income taxes 7,423 11,257 10,850 1,928 7,879 7,856 9,224 7,629 31,458 32,588 25,806
Net income 5,602 8,044 7,866 1,824         23,336 26,581 12,654
Net income $ 5,624 $ 7,951 $ 7,904 $ 1,824 $ 5,264 $ 9,054 $ 6,735 $ 5,528 $ 23,303 $ 26,581 $ 12,654
Net income, basic $ 1.12 $ 1.58 $ 1.57 $ 0.36 $ 1.05 $ 1.80 $ 1.34 $ 1.10 $ 4.63 $ 5.28 $ 2.48
Net income, diluted $ 1.09 $ 1.55 $ 1.56 $ 0.36 $ 1.02 $ 1.76 $ 1.33 $ 1.09 $ 4.58 $ 5.21 $ 2.47