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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 T | Sep. 30, 2013 T | Sep. 30, 2014 T | Sep. 30, 2013 T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 465,092 | $ 456,648 | $ 1,366,154 | $ 1,287,804
Energy and related sales, net | 860 | 1,196 | 6,912 | 2,721
Total revenue | 465,952 | 457,844 | 1,373,066 | 1,290,525
Cost of products sold | 385,439 | 391,805 | 1,196,076 | 1,126,271
Gross profit (loss) | 80,513 | 66,039 | 176,990 | 164,254
SG&A | 37,886 | 34,480 | 103,751 | 102,495
Gains on dispositions of plant, equipment and timberlands, net | (1,590) | (282) | (3,881) | (374)
Total operating income (loss) | 44,217 | 31,841 | 77,120 | 62,133
Non-operating expense | (4,808) | (4,730) | (13,997) | (12,515)
Income (loss) before income taxes | 39,409 | 27,111 | 63,123 | 49,618
Supplementary Data |  |  |  |
Net tons sold | 274,700 | 268,700 | 796,800 | 771,900
Depreciation, depletion and amortization | 16,700 | 18,000 | 53,547 | 50,028
Capital expenditures | 16,900 | 25,300 | 47,000 | 86,100
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 154,500 | 161,500 | 470,100 | 415,900
Total revenue | 154,500 | 161,500 | 470,100 | 415,900
Cost of products sold | 123,700 | 129,500 | 376,700 | 334,500
Gross profit (loss) | 30,800 | 31,900 | 93,400 | 81,300
SG&A | 12,600 | 13,000 | 38,800 | 34,400
Total operating income (loss) | 18,100 | 18,900 | 54,600 | 46,900
Income (loss) before income taxes | 18,100 | 18,900 | 54,600 | 46,900
Supplementary Data |  |  |  |
Net tons sold | 40,100 | 40,300 | 119,500 | 97,900
Depreciation, depletion and amortization | 7,400 | 7,100 | 22,700 | 17,700
Capital expenditures | 5,400 | 12,800 | 16,700 | 49,000
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 74,400 | 69,500 | 216,200 | 202,200
Total revenue | 74,400 | 69,500 | 216,200 | 202,200
Cost of products sold | 64,700 | 63,700 | 189,900 | 182,000
Gross profit (loss) | 9,700 | 5,800 | 26,300 | 20,100
SG&A | 2,200 | 1,900 | 6,800 | 6,400
Total operating income (loss) | 7,500 | 3,900 | 19,500 | 13,700
Income (loss) before income taxes | 7,500 | 3,900 | 19,500 | 13,700
Supplementary Data |  |  |  |
Net tons sold | 26,300 | 24,800 | 76,000 | 72,400
Depreciation, depletion and amortization | 2,300 | 2,200 | 6,900 | 6,600
Capital expenditures | 1,300 | 800 | 4,100 | 4,800
Specialty Papers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 236,200 | 225,700 | 679,900 | 669,800
Energy and related sales, net | 900 | 1,200 | 6,900 | 2,700
Total revenue | 237,100 | 226,900 | 686,800 | 672,500
Cost of products sold | 195,200 | 196,400 | 624,300 | 599,700
Gross profit (loss) | 41,900 | 30,500 | 62,500 | 72,800
SG&A | 14,100 | 12,500 | 39,500 | 40,300
Total operating income (loss) | 27,800 | 18,100 | 23,000 | 32,500
Income (loss) before income taxes | 27,800 | 18,100 | 23,000 | 32,500
Supplementary Data |  |  |  |
Net tons sold | 208,400 | 203,600 | 601,300 | 601,600
Depreciation, depletion and amortization | 6,500 | 8,300 | 22,600 | 24,900
Capital expenditures | 9,700 | 11,100 | 24,500 | 27,900
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of products sold | 1,800 | 2,300 | 5,200 | 10,000
Gross profit (loss) | (1,800) | (2,300) | (5,200) | (10,000)
SG&A | 900 | 7,100 | 18,700 | 21,300
Gains on dispositions of plant, equipment and timberlands, net | (1,600) | (300) | (3,900) | (400)
Total operating income (loss) | (9,200) | (9,100) | (20,000) | (31,000)
Non-operating expense | (4,800) | (4,700) | (14,000) | (12,500)
Income (loss) before income taxes | (14,000) | (13,800) | (34,000) | (43,500)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 500 | 400 | 1,300 | 800
Capital expenditures | $ 500 | $ 700 | $ 1,700 | $ 4,400

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