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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income (loss) |  | $ (95,126) | $ 7,060 | $ (100,353) | $ 8,907
Pension Benefits [Member] | Curtailment Recognition [Member] | Reclassifications Out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income (loss) |  | 1,805 |  | 1,805 |
Specialty Papers [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Selling price of business unit | $ 360,000 |  |  |  |
Cash proceeds from divestiture of business | 323,000 |  |  |  |
Retiree healthcare liabilities | 38,000 |  |  |  |
Pension liabilities assumed | 220,000 |  |  |  |
Related assets transferred from existing pension plan | $ 270,000 |  |  |  |
Income (loss) |  | $ (95,126) | $ 7,060 | $ (100,353) | $ 8,907

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