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Discontinued Operations - Summary of Discontinued Operations included in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Non-operating income (expense) |  |  |  |
Income (loss) before income taxes |  | $ 1,062 | $ (135) | $ 1,291
Income tax provision (benefit) |  | (2,519) |  | (2,511)
Income (loss) from discontinued operations | $ 0 | 3,581 | (135) | 3,802
Specialty Papers [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Selling, general and administrative expenses |  | (2,455) | 135 | (2,684)
Operating income (loss) |  | 2,455 | (135) | 2,684
Non-operating income (expense) |  |  |  |
Other, net |  | (1,393) |  | (1,393)
Income (loss) before income taxes |  | 1,062 | (135) | 1,291
Income tax provision (benefit) |  | (2,519) |  | (2,511)
Income (loss) from discontinued operations |  | $ 3,581 | $ (135) | $ 3,802

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