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