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Summary of Pro forma Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
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