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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
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Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |
Net sales | $ 143,980 | $ 158,270
Loss before income taxes and equity in earnings | (15,844) | (4,962)
Net loss | $ (11,868) | $ (2,566)
Basic and diluted loss per common share | $ (0.58) | $ (0.13)

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