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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) T | Mar. 31, 2015 USD ($) T
Segment Reporting Information [Line Items] |  |
Net sales | $ 402,218,000 | $ 417,469,000
Energy and related sales, net | 666,000 | 2,068,000
Total revenue | 402,884,000 | 419,537,000
Cost of products sold | 345,041,000 | 367,429,000
Gross profit (loss) | 57,843,000 | 52,108,000
SG&A | 31,858,000 | 31,272,000
Gains on dispositions of plant, equipment and timberlands, net | 24,000 | (2,654,000)
Total operating income (loss) | 25,961,000 | 23,490,000
Non-operating expense | (4,725,000) | (4,630,000)
Income (loss) before income taxes | $ 21,236,000 | $ 18,860,000
Supplementary Data |  |
Net tons sold | T | 267,200 | 260,700
Depreciation, depletion and amortization | $ 16,646,000 | $ 15,975,000
Capital expenditures | 43,300,000 | 21,700,000
Composite Fibers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 123,500,000 | 135,300,000
Total revenue | 123,500,000 | 135,300,000
Cost of products sold | 101,200,000 | 109,000,000
Gross profit (loss) | 22,300,000 | 26,300,000
SG&A | 11,100,000 | 11,600,000
Total operating income (loss) | 11,200,000 | 14,700,000
Income (loss) before income taxes | $ 11,200,000 | $ 14,700,000
Supplementary Data |  |
Net tons sold | T | 36,900 | 38,000
Depreciation, depletion and amortization | $ 7,100,000 | $ 6,700,000
Capital expenditures | 6,300,000 | 5,900,000
Advanced Airlaid Materials [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 60,800,000 | 62,300,000
Total revenue | 60,800,000 | 62,300,000
Cost of products sold | 52,200,000 | 55,100,000
Gross profit (loss) | 8,600,000 | 7,200,000
SG&A | 2,000,000 | 1,900,000
Total operating income (loss) | 6,600,000 | 5,300,000
Income (loss) before income taxes | $ 6,600,000 | $ 5,300,000
Supplementary Data |  |
Net tons sold | T | 24,500 | 24,100
Depreciation, depletion and amortization | $ 2,300,000 | $ 2,200,000
Capital expenditures | 14,700,000 | 1,300,000
Specialty Papers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 217,900,000 | 219,900,000
Energy and related sales, net | 700,000 | 2,100,000
Total revenue | 218,600,000 | 222,000,000
Cost of products sold | 191,100,000 | 200,400,000
Gross profit (loss) | 27,500,000 | 21,600,000
SG&A | 12,500,000 | 12,100,000
Total operating income (loss) | 15,000,000 | 9,500,000
Income (loss) before income taxes | $ 15,000,000 | $ 9,500,000
Supplementary Data |  |
Net tons sold | T | 205,800 | 198,700
Depreciation, depletion and amortization | $ 6,700,000 | $ 6,600,000
Capital expenditures | 22,000,000 | 13,200,000
Other and Unallocated [Member] |  |
Segment Reporting Information [Line Items] |  |
Cost of products sold | 500,000 | 2,900,000
Gross profit (loss) | (500,000) | (2,900,000)
SG&A | 6,300,000 | 5,600,000
Gains on dispositions of plant, equipment and timberlands, net |  | (2,700,000)
Total operating income (loss) | (6,800,000) | (5,800,000)
Non-operating expense | (4,700,000) | (4,600,000)
Income (loss) before income taxes | (11,500,000) | (10,400,000)
Supplementary Data |  |
Depreciation, depletion and amortization | 500,000 | 500,000
Capital expenditures | $ 300,000 | $ 1,300,000

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