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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income (loss) |  |  | $ (177,156) | $ 13,526 | $ 35,731
Pension Benefits [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Related assets transferred from existing pension plan |  |  | 25,700 | 27,900 |
Pension Benefits [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) |  |  | 75,996 | 15,105 | 23,175
Pension Benefits [Member] | Curtailment and Settlement 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) |  |  | 54,000 |  |
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 | $ 360,000 |  |  |
Cash proceeds from divestiture of business |  | 323,000 |  |  |
Retiree healthcare liabilities | 38,000 | 38,000 |  |  |
Pension liabilities assumed | 210,000 | 210,000 |  |  |
Related assets transferred from existing pension plan | $ 280,000 | $ 280,000 |  |  |
Impairment charge |  |  | 144,124 |  |
Income (loss) |  |  | $ (177,156) | $ 13,526 | $ 35,731

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