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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, 2016 USD ($) T | Sep. 30, 2015 USD ($) T | Sep. 30, 2016 USD ($) T | Sep. 30, 2015 USD ($) T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 405,301 | $ 419,960 | $ 1,213,932 | $ 1,248,232
Energy and related sales, net | 1,346 | 1,153 | 4,013 | 3,936
Total revenues | 406,647 | 421,113 | 1,217,945 | 1,252,168
Cost of products sold | 345,477 | 361,205 | 1,056,209 | 1,107,319
Gross profit | 61,170 | 59,908 | 161,736 | 144,849
SG&A | 35,747 | 39,792 | 104,796 | 100,201
Losses (gains) on dispositions of plant, equipment and timberlands, net | 5 | (123) | 31 | (2,888)
Operating income | 25,418 | 20,239 | 56,909 | 47,536
Non-operating expense | (4,416) | (4,447) | (12,716) | (13,137)
Income before income taxes | $ 21,002 | $ 15,792 | $ 44,193 | $ 34,399
Supplementary Data |  |  |  |
Net tons sold | T | 261,500 | 267,200 | 788,500 | 781,200
Depreciation, depletion and amortization | $ 16,300 | $ 15,800 | $ 49,725 | $ 47,423
Capital expenditures | 36,600 | 29,700 | 116,900 | 74,300
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 131,700 | 133,900 | 391,600 | 409,600
Total revenues | 131,700 | 133,900 | 391,600 | 409,600
Cost of products sold | 105,800 | 108,400 | 316,000 | 329,800
Gross profit | 25,900 | 25,500 | 75,600 | 79,800
SG&A | 11,900 | 11,500 | 35,100 | 34,400
Operating income | 14,000 | 14,100 | 40,500 | 45,400
Income before income taxes | $ 14,000 | $ 14,100 | $ 40,500 | $ 45,400
Supplementary Data |  |  |  |
Net tons sold | T | 39,100 | 38,900 | 116,700 | 116,200
Depreciation, depletion and amortization | $ 6,900 | $ 6,700 | $ 21,200 | $ 20,100
Capital expenditures | 5,100 | 5,800 | 13,700 | 17,300
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 61,900 | 63,200 | 183,400 | 183,000
Total revenues | 61,900 | 63,200 | 183,400 | 183,000
Cost of products sold | 53,500 | 54,600 | 157,500 | 162,000
Gross profit | 8,400 | 8,600 | 25,900 | 21,000
SG&A | 2,000 | 1,800 | 6,200 | 5,800
Operating income | 6,400 | 6,800 | 19,700 | 15,200
Income before income taxes | $ 6,400 | $ 6,800 | $ 19,700 | $ 15,200
Supplementary Data |  |  |  |
Net tons sold | T | 25,200 | 24,800 | 74,100 | 71,400
Depreciation, depletion and amortization | $ 2,400 | $ 2,200 | $ 7,000 | $ 6,500
Capital expenditures | 4,300 | 1,800 | 25,000 | 4,600
Specialty Papers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 211,800 | 222,800 | 638,900 | 655,600
Energy and related sales, net | 1,300 | 1,200 | 4,000 | 3,900
Total revenues | 213,100 | 224,000 | 642,900 | 659,500
Cost of products sold | 180,100 | 196,100 | 574,100 | 608,400
Gross profit | 33,000 | 27,900 | 68,800 | 51,100
SG&A | 14,300 | 10,400 | 40,900 | 34,200
Operating income | 18,700 | 17,500 | 27,900 | 16,900
Income before income taxes | $ 18,700 | $ 17,500 | $ 27,900 | $ 16,900
Supplementary Data |  |  |  |
Net tons sold | T | 197,300 | 203,600 | 597,700 | 593,600
Depreciation, depletion and amortization | $ 6,400 | $ 6,400 | $ 19,700 | $ 19,300
Capital expenditures | 26,700 | 22,100 | 77,400 | 51,000
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of products sold | 6,100 | 2,100 | 8,600 | 7,100
Gross profit | (6,100) | (2,100) | (8,600) | (7,100)
SG&A | 7,500 | 16,200 | 22,600 | 25,700
Losses (gains) on dispositions of plant, equipment and timberlands, net |  | (100) |  | (2,900)
Operating income | (13,600) | (18,200) | (31,200) | (29,900)
Non-operating expense | (4,400) | (4,400) | (12,700) | (13,100)
Income before income taxes | (18,000) | (22,600) | (43,900) | (43,000)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 600 | $ 500 | 1,800 | 1,500
Capital expenditures | $ 500 |  | $ 800 | $ 1,400

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