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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) T | Jun. 30, 2016 USD ($) T | Jun. 30, 2017 USD ($) T | Jun. 30, 2016 USD ($) T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 387,342 | $ 406,413 | $ 778,055 | $ 808,631
Energy and related sales, net | 981 | 2,001 | 2,110 | 2,667
Total revenues | 388,323 | 408,414 | 780,165 | 811,298
Cost of products sold | 357,887 | 365,691 | 692,800 | 710,732
Gross profit | 30,436 | 42,723 | 87,365 | 100,566
SG&A | 31,999 | 37,191 | 67,085 | 69,049
(Gains) losses on dispositions of plant, equipment and timberlands, net | (58) | 2 | (26) | 26
Operating income (loss) | (1,505) | 5,530 | 20,306 | 31,491
Non-operating expense | (4,580) | (3,575) | (8,754) | (8,300)
(Loss) income before income taxes | $ (6,085) | $ 1,955 | $ 11,552 | $ 23,191
Supplementary Data |  |  |  |
Net tons sold | T | 251,500 | 259,700 | 512,400 | 527,000
Depreciation, depletion and amortization | $ 17,700 | $ 16,800 | $ 34,967 | $ 33,411
Capital expenditures | 34,300 | 37,100 | 71,000 | 80,400
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 133,100 | 136,400 | 258,200 | 259,900
Total revenues | 133,100 | 136,400 | 258,200 | 259,900
Cost of products sold | 107,600 | 109,000 | 207,200 | 210,300
Gross profit | 25,500 | 27,400 | 51,000 | 49,600
SG&A | 10,800 | 12,100 | 21,900 | 23,200
Operating income (loss) | 14,700 | 15,300 | 29,100 | 26,400
(Loss) income before income taxes | $ 14,700 | $ 15,300 | $ 29,100 | $ 26,400
Supplementary Data |  |  |  |
Net tons sold | T | 41,900 | 40,700 | 80,700 | 77,600
Depreciation, depletion and amortization | $ 7,000 | $ 7,200 | $ 13,800 | $ 14,300
Capital expenditures | 2,100 | 2,300 | 6,800 | 8,600
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 62,800 | 60,800 | 122,700 | 121,500
Total revenues | 62,800 | 60,800 | 122,700 | 121,500
Cost of products sold | 53,000 | 51,800 | 103,500 | 104,100
Gross profit | 9,800 | 9,000 | 19,200 | 17,400
SG&A | 2,300 | 2,200 | 4,600 | 4,200
Operating income (loss) | 7,500 | 6,800 | 14,600 | 13,200
(Loss) income before income taxes | $ 7,500 | $ 6,800 | $ 14,600 | $ 13,200
Supplementary Data |  |  |  |
Net tons sold | T | 25,500 | 24,400 | 50,300 | 48,900
Depreciation, depletion and amortization | $ 2,300 | $ 2,400 | $ 4,600 | $ 4,700
Capital expenditures | 12,900 | 6,100 | 23,500 | 20,700
Specialty Papers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 191,400 | 209,300 | 397,100 | 427,200
Energy and related sales, net | 1,000 | 2,000 | 2,100 | 2,700
Total revenues | 192,400 | 211,300 | 399,200 | 429,900
Cost of products sold | 195,900 | 202,900 | 376,000 | 394,000
Gross profit | (3,500) | 8,400 | 23,200 | 35,900
SG&A | 10,300 | 14,200 | 23,800 | 26,600
Operating income (loss) | (13,800) | (5,800) | (600) | 9,300
(Loss) income before income taxes | $ (13,800) | $ (5,800) | $ (600) | $ 9,300
Supplementary Data |  |  |  |
Net tons sold | T | 184,100 | 194,700 | 381,400 | 400,500
Depreciation, depletion and amortization | $ 7,700 | $ 6,500 | $ 14,900 | $ 13,200
Capital expenditures | 15,800 | 28,700 | 34,000 | 50,800
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of products sold | 1,400 | 2,000 | 6,100 | 2,300
Gross profit | (1,400) | (2,000) | (6,100) | (2,300)
SG&A | 8,600 | 8,700 | 16,800 | 15,000
(Gains) losses on dispositions of plant, equipment and timberlands, net | (100) |  |  |
Operating income (loss) | (9,900) | (10,700) | (22,900) | (17,300)
Non-operating expense | (4,600) | (3,600) | (8,800) | (8,300)
(Loss) income before income taxes | (14,500) | (14,300) | (31,700) | (25,600)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 700 | $ 700 | 1,700 | 1,200
Capital expenditures | $ 3,500 |  | $ 6,700 | $ 300

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