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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) T | Sep. 30, 2016 USD ($) T | Sep. 30, 2017 USD ($) T | Sep. 30, 2016 USD ($) T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 413,325 | $ 405,301 | $ 1,191,380 | $ 1,213,932
Energy and related sales, net | 1,236 | 1,346 | 3,346 | 4,013
Total revenues | 414,561 | 406,647 | 1,194,726 | 1,217,945
Cost of products sold | 359,826 | 345,477 | 1,052,626 | 1,056,209
Gross profit | 54,735 | 61,170 | 142,100 | 161,736
SG&A | 33,399 | 35,747 | 100,484 | 104,796
(Gains) losses on dispositions of plant, equipment and timberlands, net | (24) | 5 | (50) | 31
Operating income | 21,360 | 25,418 | 41,666 | 56,909
Non-operating expense | (4,974) | (4,416) | (13,728) | (12,716)
Income before income taxes | $ 16,386 | $ 21,002 | $ 27,938 | $ 44,193
Supplementary Data |  |  |  |
Net tons sold | T | 267,100 | 261,500 | 779,500 | 788,500
Depreciation, depletion and amortization | $ 21,400 | $ 16,300 | $ 56,343 | $ 49,725
Capital expenditures | 31,100 | 36,600 | 102,200 | 116,900
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 142,300 | 131,700 | 400,600 | 391,600
Total revenues | 142,300 | 131,700 | 400,600 | 391,600
Cost of products sold | 115,000 | 105,800 | 322,200 | 316,000
Gross profit | 27,300 | 25,900 | 78,400 | 75,600
SG&A | 10,900 | 11,900 | 32,900 | 35,100
Operating income | 16,400 | 14,000 | 45,500 | 40,500
Income before income taxes | $ 16,400 | $ 14,000 | $ 45,500 | $ 40,500
Supplementary Data |  |  |  |
Net tons sold | T | 43,800 | 39,100 | 124,500 | 116,700
Depreciation, depletion and amortization | $ 7,100 | $ 6,900 | $ 20,900 | $ 21,200
Capital expenditures | 3,800 | 5,100 | 10,600 | 13,700
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 67,800 | 61,900 | 190,400 | 183,400
Total revenues | 67,800 | 61,900 | 190,400 | 183,400
Cost of products sold | 57,200 | 53,500 | 160,700 | 157,500
Gross profit | 10,600 | 8,400 | 29,700 | 25,900
SG&A | 2,400 | 2,000 | 6,900 | 6,200
Operating income | 8,200 | 6,400 | 22,800 | 19,700
Income before income taxes | $ 8,200 | $ 6,400 | $ 22,800 | $ 19,700
Supplementary Data |  |  |  |
Net tons sold | T | 26,200 | 25,200 | 76,600 | 74,100
Depreciation, depletion and amortization | $ 2,500 | $ 2,400 | $ 7,100 | $ 7,000
Capital expenditures | 12,600 | 4,300 | 36,100 | 25,000
Specialty Papers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 203,200 | 211,800 | 600,300 | 638,900
Energy and related sales, net | 1,200 | 1,300 | 3,300 | 4,000
Total revenues | 204,400 | 213,100 | 603,600 | 642,900
Cost of products sold | 179,700 | 180,100 | 555,700 | 574,100
Gross profit | 24,700 | 33,000 | 47,900 | 68,800
SG&A | 12,200 | 14,300 | 36,000 | 40,900
Operating income | 12,500 | 18,700 | 11,900 | 27,900
Income before income taxes | $ 12,500 | $ 18,700 | $ 11,900 | $ 27,900
Supplementary Data |  |  |  |
Net tons sold | T | 197,100 | 197,300 | 578,400 | 597,700
Depreciation, depletion and amortization | $ 8,000 | $ 6,400 | $ 22,900 | $ 19,700
Capital expenditures | 10,200 | 26,700 | 44,200 | 77,400
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of products sold | 7,900 | 6,100 | 14,000 | 8,600
Gross profit | (7,900) | (6,100) | (14,000) | (8,600)
SG&A | 7,900 | 7,500 | 24,700 | 22,600
Operating income | (15,800) | (13,600) | (38,700) | (31,200)
Non-operating expense | (5,000) | (4,400) | (13,700) | (12,700)
Income before income taxes | (20,800) | (18,000) | (52,400) | (43,900)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 3,800 | 600 | 5,400 | 1,800
Capital expenditures | $ 4,500 | $ 500 | $ 11,300 | $ 800

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