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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 T | Jun. 30, 2013 T | Jun. 30, 2014 T | Jun. 30, 2013 T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 445,341 | $ 425,967 | $ 901,062 | $ 831,156
Energy and related sales, net | 790 | 424 | 6,052 | 1,525
Total revenue | 446,131 | 426,391 | 907,114 | 832,681
Cost of products sold | 404,694 | 385,551 | 810,637 | 734,466
Gross profit (loss) | 41,437 | 40,840 | 96,477 | 98,215
SG&A | 32,314 | 34,528 | 65,865 | 68,015
Gains on dispositions of plant, equipment and timberlands, net | (1,482) | (19) | (2,291) | (92)
Total operating income (loss) | 10,605 | 6,331 | 32,903 | 30,292
Non-operating expense | (4,649) | (4,293) | (9,189) | (7,785)
Income (loss) before income taxes | 5,956 | 2,038 | 23,714 | 22,507
Supplementary Data |  |  |  |
Net tons sold | 254,800 | 254,400 | 522,100 | 503,200
Depreciation, depletion and amortization | 18,300 | 16,700 | 36,893 | 32,024
Capital expenditures | 15,700 | 29,400 | 30,200 | 60,800
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 157,000 | 142,600 | 315,600 | 254,400
Total revenue | 157,000 | 142,600 | 315,600 | 254,400
Cost of products sold | 126,900 | 114,600 | 252,900 | 205,000
Gross profit (loss) | 30,100 | 27,900 | 62,700 | 49,400
SG&A | 12,800 | 11,500 | 26,100 | 21,300
Total operating income (loss) | 17,300 | 16,400 | 36,600 | 28,100
Income (loss) before income taxes | 17,300 | 16,400 | 36,600 | 28,100
Supplementary Data |  |  |  |
Net tons sold | 39,400 | 35,000 | 79,400 | 57,600
Depreciation, depletion and amortization | 7,600 | 5,900 | 15,300 | 10,600
Capital expenditures | 5,400 | 18,800 | 11,400 | 36,200
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 70,500 | 66,400 | 141,800 | 132,700
Total revenue | 70,500 | 66,400 | 141,800 | 132,700
Cost of products sold | 62,000 | 58,800 | 125,100 | 118,400
Gross profit (loss) | 8,500 | 7,600 | 16,700 | 14,300
SG&A | 2,300 | 2,400 | 4,700 | 4,500
Total operating income (loss) | 6,200 | 5,200 | 12,000 | 9,800
Income (loss) before income taxes | 6,200 | 5,200 | 12,000 | 9,800
Supplementary Data |  |  |  |
Net tons sold | 24,600 | 23,700 | 49,700 | 47,600
Depreciation, depletion and amortization | 2,300 | 2,200 | 4,600 | 4,400
Capital expenditures | 1,400 | 1,900 | 2,900 | 4,000
Specialty Papers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 217,900 | 217,000 | 443,700 | 444,100
Energy and related sales, net | 800 | 400 | 6,100 | 1,500
Total revenue | 218,700 | 217,400 | 449,800 | 445,600
Cost of products sold | 214,100 | 207,900 | 429,100 | 403,400
Gross profit (loss) | 4,600 | 9,500 | 20,700 | 42,300
SG&A | 11,800 | 13,400 | 25,500 | 27,900
Total operating income (loss) | (7,200) | (3,900) | (4,800) | 14,400
Income (loss) before income taxes | (7,200) | (3,900) | (4,800) | 14,400
Supplementary Data |  |  |  |
Net tons sold | 190,700 | 195,700 | 392,900 | 398,000
Depreciation, depletion and amortization | 7,900 | 8,300 | 16,100 | 16,600
Capital expenditures | 8,600 | 8,200 | 14,800 | 16,800
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of products sold | 1,700 | 4,200 | 3,500 | 7,700
Gross profit (loss) | (1,700) | (4,200) | (3,500) | (7,700)
SG&A | 5,400 | 7,300 | 9,600 | 14,300
Gains on dispositions of plant, equipment and timberlands, net | (1,500) |  | (2,300) | (100)
Total operating income (loss) | (5,600) | (11,500) | (10,800) | (21,900)
Non-operating expense | (4,600) | (4,300) | (9,200) | (7,800)
Income (loss) before income taxes | (10,200) | (15,800) | (20,000) | (29,700)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 500 | 200 | 900 | 400
Capital expenditures | $ 300 | $ 600 | $ 1,100 | $ 3,800

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