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Discontinued Operations - Summary of Discontinued Operations included in Condensed Consolidated Statements of Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non-operating income (expense) |  |  |
Income (loss) before income taxes | $ (207,242) | $ 19,868 | $ 53,388
Income tax provision (benefit) | (30,086) | 6,342 | 17,657
Income (loss) from discontinued operations | (177,156) | 13,526 | 35,731
Specialty Papers [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Total revenues | 664,574 | 796,061 | 849,723
Costs of products sold | 637,472 | 751,135 | 767,320
Gross profit | 27,102 | 44,926 | 82,403
Selling, general and administrative expenses | 32,465 | 22,538 | 29,701
(Gains) losses on dispositions of plant, equipment and timberlands, net | (423) | 219 | 101
Operating income (loss) | (4,940) | 22,169 | 52,601
Non-operating income (expense) |  |  |
Interest expense | (6,942) | (4,455) | (1,972)
Other, net | (51,236) | 2,154 | 2,759
Impairment charge | (144,124) |  |
Income (loss) before income taxes | (207,242) | 19,868 | 53,388
Income tax provision (benefit) | (30,086) | 6,342 | 17,657
Income (loss) from discontinued operations | (177,156) | 13,526 | 35,731
Specialty Papers [Member] | Product [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Total revenues | 661,186 | 790,935 | 843,582
Specialty Papers [Member] | Energy and Related Sales Net [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Total revenues | $ 3,388 | $ 5,126 | $ 6,141

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