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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Non-operating income (expense) |  |  |  |
Income (loss) before income taxes | $ (114,656) | $ 9,661 | $ (128,714) | $ 14,422
Income tax provision (benefit) | (19,530) | 2,601 | (28,361) | 5,515
Income (loss) from discontinued operations | (95,126) | 7,060 | (100,353) | 8,907
Specialty Papers [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Total revenues | 202,132 | 204,442 | 593,974 | 603,692
Costs of products sold | 181,628 | 188,076 | 572,820 | 569,840
Gross profit | 20,504 | 16,366 | 21,154 | 33,852
Selling, general and administrative expenses | 6,058 | 5,997 | 18,566 | 17,971
(Gains) losses on dispositions of plant, equipment and timberlands, net | 3 | 70 | (440) | 118
Operating income | 14,443 | 10,299 | 3,028 | 15,763
Non-operating income (expense) |  |  |  |
Interest expense | (2,281) | (1,221) | (6,017) | (3,005)
Other, net | (1,174) | 583 | (81) | 1,664
Impairment charge | (125,644) |  | (125,644) |
Income (loss) before income taxes | (114,656) | 9,661 | (128,714) | 14,422
Income tax provision (benefit) | (19,530) | 2,601 | (28,361) | 5,515
Income (loss) from discontinued operations | (95,126) | 7,060 | (100,353) | 8,907
Specialty Papers [Member] | Product [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Total revenues | 201,288 | 203,206 | 590,757 | 600,346
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 | $ 844 | $ 1,236 | $ 3,217 | $ 3,346

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