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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, 2015 USD ($) T | Jun. 30, 2014 USD ($) T | Jun. 30, 2015 USD ($) T | Jun. 30, 2014 USD ($) T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 410,803 | $ 445,341 | $ 828,272 | $ 901,062
Energy and related sales, net | 715 | 790 | 2,783 | 6,052
Total revenue | 411,518 | 446,131 | 831,055 | 907,114
Cost of products sold | 378,685 | 404,694 | 746,114 | 810,637
Gross profit (loss) | 32,833 | 41,437 | 84,941 | 96,477
SG&A | 29,137 | 32,314 | 60,409 | 65,865
Gains on dispositions of plant, equipment and timberlands, net | (111) | (1,482) | (2,765) | (2,291)
Total operating income (loss) | 3,807 | 10,605 | 27,297 | 32,903
Non-operating expense | (4,060) | (4,649) | (8,690) | (9,189)
Income (loss) before income taxes | $ (253) | $ 5,956 | $ 18,607 | $ 23,714
Supplementary Data |  |  |  |
Net tons sold | T | 253,300 | 254,800 | 514,000 | 522,100
Depreciation, depletion and amortization | $ 15,600 | $ 18,300 | $ 31,602 | $ 36,893
Capital expenditures | 22,800 | 15,700 | 44,600 | 30,200
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 140,400 | 157,000 | 275,700 | 315,600
Total revenue | 140,400 | 157,000 | 275,700 | 315,600
Cost of products sold | 112,400 | 126,900 | 221,500 | 252,900
Gross profit (loss) | 28,000 | 30,100 | 54,200 | 62,700
SG&A | 11,300 | 12,800 | 22,900 | 26,100
Total operating income (loss) | 16,700 | 17,300 | 31,300 | 36,600
Income (loss) before income taxes | $ 16,700 | $ 17,300 | $ 31,300 | $ 36,600
Supplementary Data |  |  |  |
Net tons sold | T | 39,400,000 | 39,400,000 | 77,300,000 | 79,400,000
Depreciation, depletion and amortization | $ 6,700 | $ 7,600 | $ 13,400 | $ 15,300
Capital expenditures | 5,600 | 5,400 | 11,500 | 11,400
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 57,500 | 70,500 | 119,800 | 141,800
Total revenue | 57,500 | 70,500 | 119,800 | 141,800
Cost of products sold | 52,300 | 62,000 | 107,300 | 125,100
Gross profit (loss) | 5,200 | 8,500 | 12,500 | 16,700
SG&A | 2,100 | 2,300 | 4,000 | 4,700
Total operating income (loss) | 3,100 | 6,200 | 8,500 | 12,000
Income (loss) before income taxes | $ 3,100 | $ 6,200 | $ 8,500 | $ 12,000
Supplementary Data |  |  |  |
Net tons sold | T | 22,600,000 | 24,600,000 | 46,700,000 | 49,700,000
Depreciation, depletion and amortization | $ 2,100 | $ 2,300 | $ 4,300 | $ 4,600
Capital expenditures | 1,500 | 1,400 | 2,800 | 2,900
Specialty Papers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 212,900 | 217,900 | 432,800 | 443,700
Energy and related sales, net | 700 | 800 | 2,800 | 6,100
Total revenue | 213,600 | 218,700 | 435,600 | 449,800
Cost of products sold | 211,900 | 214,100 | 412,300 | 429,100
Gross profit (loss) | 1,700 | 4,600 | 23,300 | 20,700
SG&A | 11,700 | 11,800 | 23,900 | 25,500
Total operating income (loss) | (10,000) | (7,200) | (600) | (4,800)
Income (loss) before income taxes | $ (10,000) | $ (7,200) | $ (600) | $ (4,800)
Supplementary Data |  |  |  |
Net tons sold | T | 191,300,000 | 190,700,000 | 390,000,000 | 392,900,000
Depreciation, depletion and amortization | $ 6,300 | $ 7,900 | $ 12,900 | $ 16,100
Capital expenditures | 15,600 | 8,600 | 28,800 | 14,800
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of products sold | 2,100 | 1,700 | 5,000 | 3,500
Gross profit (loss) | (2,100) | (1,700) | (5,000) | (3,500)
SG&A | 4,000 | 5,400 | 9,500 | 9,600
Gains on dispositions of plant, equipment and timberlands, net | (100) | (1,500) | (2,800) | (2,300)
Total operating income (loss) | (6,000) | (5,600) | (11,700) | (10,800)
Non-operating expense | (4,100) | (4,600) | (8,700) | (9,200)
Income (loss) before income taxes | (10,100) | (10,200) | (20,400) | (20,000)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 500 | 500 | 1,000 | 900
Capital expenditures | $ 100 | $ 300 | $ 1,500 | $ 1,100

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