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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) T | Mar. 31, 2017 USD ($) T
Segment Reporting Information [Line Items] |  |
Net sales | $ 410,647 | $ 390,713
Energy and related sales, net | 1,428 | 1,129
Total revenues | 412,075 | 391,842
Cost of products sold | 363,169 | 336,213
Gross profit | 48,906 | 55,629
SG&A | 37,063 | 34,877
(Gains) losses on dispositions of plant, equipment and timberlands, net | (1,554) | 32
Operating income | 13,397 | 20,720
Non-operating expense | (4,912) | (3,083)
Income before income taxes | $ 8,485 | $ 17,637
Supplementary Data |  |
Net tons sold | T | 254,800 | 260,800
Depreciation, depletion and amortization | $ 19,431 | $ 17,282
Capital expenditures | 26,600 | 36,800
Composite Fibers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 141,600 | 125,100
Total revenues | 141,600 | 125,100
Cost of products sold | 114,700 | 99,600
Gross profit | 26,900 | 25,500
SG&A | 11,600 | 11,100
Operating income | 15,300 | 14,400
Income before income taxes | $ 15,300 | $ 14,400
Supplementary Data |  |
Net tons sold | T | 40,000 | 38,800
Depreciation, depletion and amortization | $ 7,400 | $ 6,800
Capital expenditures | 5,100 | 4,700
Advanced Airlaid Materials [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 69,600 | 59,800
Total revenues | 69,600 | 59,800
Cost of products sold | 59,700 | 50,500
Gross profit | 9,900 | 9,300
SG&A | 2,700 | 2,200
Operating income | 7,200 | 7,100
Income before income taxes | $ 7,200 | $ 7,100
Supplementary Data |  |
Net tons sold | T | 26,300 | 24,800
Depreciation, depletion and amortization | $ 2,800 | $ 2,300
Capital expenditures | 13,200 | 10,600
Specialty Papers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 199,400 | 205,800
Energy and related sales, net | 1,400 | 1,100
Total revenues | 200,800 | 206,900
Cost of products sold | 186,500 | 179,900
Gross profit | 14,300 | 27,000
SG&A | 11,900 | 13,500
Operating income | 2,400 | 13,500
Income before income taxes | $ 2,400 | $ 13,500
Supplementary Data |  |
Net tons sold | T | 188,400 | 197,200
Depreciation, depletion and amortization | $ 8,100 | $ 7,200
Capital expenditures | 6,500 | 18,300
Other and Unallocated [Member] |  |
Segment Reporting Information [Line Items] |  |
Cost of products sold | 2,300 | 6,200
Gross profit | (2,300) | (6,200)
SG&A | 10,900 | 8,100
(Gains) losses on dispositions of plant, equipment and timberlands, net | (1,600) |
Operating income | (11,600) | (14,300)
Non-operating expense | (4,900) | (3,100)
Income before income taxes | (16,500) | (17,400)
Supplementary Data |  |
Depreciation, depletion and amortization | 1,100 | 1,000
Capital expenditures | $ 1,800 | $ 3,200

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