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Discontinued Operations - Summary of Discontinued Operations included in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Non-operating income (expense) |  |  |  |
Income (loss) before income taxes | $ (135) | $ (485) | $ (135) | $ 229
Income tax provision (benefit) |  | (23) |  | 8
Income (loss) from discontinued operations | (135) | (462) | (135) | 221
Specialty Papers [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Selling, general and administrative expenses | 135 | 485 | 135 | (229)
Operating income (loss) | (135) | (485) | (135) | 229
Non-operating income (expense) |  |  |  |
Income (loss) before income taxes | (135) | (485) | (135) | 229
Income tax provision (benefit) |  | (23) |  | 8
Income (loss) from discontinued operations | $ (135) | $ (462) | $ (135) | $ 221

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