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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) T | Mar. 31, 2016 USD ($) T
Segment Reporting Information [Line Items] |  |
Net sales | $ 390,713 | $ 402,218
Energy and related sales, net | 1,129 | 666
Total revenues | 391,842 | 402,884
Cost of products sold | 334,913 | 345,041
Gross profit | 56,929 | 57,843
SG&A | 35,086 | 31,858
Losses on dispositions of plant, equipment and timberlands, net | 32 | 24
Operating income | 21,811 | 25,961
Non-operating expense | (4,174) | (4,725)
Income before income taxes | $ 17,637 | $ 21,236
Supplementary Data |  |
Net tons sold | T | 260,800 | 267,200
Depreciation, depletion and amortization | $ 17,282 | $ 16,646
Capital expenditures | 36,800 | 43,300
Composite Fibers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 125,100 | 123,500
Total revenues | 125,100 | 123,500
Cost of products sold | 99,600 | 101,200
Gross profit | 25,500 | 22,300
SG&A | 11,100 | 11,100
Operating income | 14,400 | 11,200
Income before income taxes | $ 14,400 | $ 11,200
Supplementary Data |  |
Net tons sold | T | 38,800 | 36,900
Depreciation, depletion and amortization | $ 6,800 | $ 7,100
Capital expenditures | 4,700 | 6,300
Advanced Airlaid Materials [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 59,800 | 60,800
Total revenues | 59,800 | 60,800
Cost of products sold | 50,500 | 52,200
Gross profit | 9,300 | 8,600
SG&A | 2,200 | 2,000
Operating income | 7,100 | 6,600
Income before income taxes | $ 7,100 | $ 6,600
Supplementary Data |  |
Net tons sold | T | 24,800 | 24,500
Depreciation, depletion and amortization | $ 2,300 | $ 2,300
Capital expenditures | 10,600 | 14,700
Specialty Papers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 205,800 | 217,900
Energy and related sales, net | 1,100 | 700
Total revenues | 206,900 | 218,600
Cost of products sold | 180,100 | 191,100
Gross profit | 26,800 | 27,500
SG&A | 13,600 | 12,500
Operating income | 13,200 | 15,000
Income before income taxes | $ 13,200 | $ 15,000
Supplementary Data |  |
Net tons sold | T | 197,200 | 205,800
Depreciation, depletion and amortization | $ 7,200 | $ 6,700
Capital expenditures | 18,300 | 22,000
Other and Unallocated [Member] |  |
Segment Reporting Information [Line Items] |  |
Cost of products sold | 4,700 | 500
Gross profit | (4,700) | (500)
SG&A | 8,200 | 6,300
Operating income | (12,900) | (6,800)
Non-operating expense | (4,200) | (4,700)
Income before income taxes | (17,100) | (11,500)
Supplementary Data |  |
Depreciation, depletion and amortization | 1,000 | 500
Capital expenditures | $ 3,200 | $ 300

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