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Summary of Pro Forma Consolidated Net Sales and Income (Loss) Before Income Taxes and Equity in Earnings (Detail) - Filament - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Net sales $ 209,448 $ 209,119 $ 502,079 $ 516,432
Income (loss) before income taxes and equity in earnings 6,956 9,742 (15,416) (1,238)
Net income (loss) $ 6,145 $ 5,009 $ (10,671) $ (801)
Diluted income (loss) per common share $ 0.30 $ 0.24 $ (0.52) $ (0.04)