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Summary of Pro forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Combinations [Abstract] |  |
Pro forma net sales | $ 458,793 | $ 433,756
Pro forma net income | $ 24,540 | $ 17,614
Pro forma earnings per common share – basic | $ 0.84 | $ 0.61
Pro forma earnings per common share – assuming dilution | $ 0.83 | $ 0.60

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