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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) T | Sep. 30, 2017 USD ($) T | Sep. 30, 2018 USD ($) T | Sep. 30, 2017 USD ($) T
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 209,855 | $ 210,120 | $ 636,806 | $ 591,035
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Cost of products sold | $ 179,983 | $ 172,745 | $ 537,073 | $ 485,783
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ 29,872 | $ 37,375 | $ 99,733 | $ 105,252
SG&A | 25,799 | 27,083 | 81,915 | 81,530
(Gains) losses on dispositions of plant, equipment and timberlands, net | (249) | (93) | (1,939) | (168)
Operating income (loss) | 4,322 | 10,385 | 19,757 | 23,890
Non-operating expense | (1,565) | (3,660) | (9,879) | (10,374)
Income (loss) before income taxes | $ 2,757 | $ 6,725 | $ 9,878 | $ 13,516
Supplementary Data |  |  |  |
Net tons sold | T | 61,500 | 63,500 | 182,800 | 182,400
Depreciation, depletion and amortization | $ 11,500 | $ 10,200 | $ 34,731 | $ 30,276
Capital expenditures | 6,200 | 21,000 | 32,200 | 58,000
Composite Fibers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 139,176 | $ 142,349 | $ 423,707 | $ 400,590
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Cost of products sold | $ 116,800 | $ 115,000 | $ 349,500 | $ 322,200
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ 22,400 | $ 27,300 | $ 74,200 | $ 78,400
SG&A | 10,500 | 10,900 | 34,000 | 32,900
Operating income (loss) | 11,900 | 16,400 | 40,200 | 45,500
Income (loss) before income taxes | $ 11,900 | $ 16,400 | $ 40,200 | $ 45,500
Supplementary Data |  |  |  |
Net tons sold | T | 37,400 | 39,700 | 110,400 | 112,900
Depreciation, depletion and amortization | $ 7,100 | $ 7,100 | $ 21,700 | $ 20,900
Capital expenditures | 3,000 | 3,800 | 10,900 | 10,600
Advanced Airlaid Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 70,679 | $ 67,771 | $ 213,099 | $ 190,445
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Cost of products sold | $ 62,300 | $ 57,200 | $ 184,700 | $ 160,700
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ 8,400 | $ 10,600 | $ 28,400 | $ 29,700
SG&A | 2,900 | 2,400 | 8,100 | 6,900
Operating income (loss) | 5,500 | 8,200 | 20,300 | 22,800
Income (loss) before income taxes | $ 5,500 | $ 8,200 | $ 20,300 | $ 22,800
Supplementary Data |  |  |  |
Net tons sold | T | 24,000 | 23,800 | 72,400 | 69,500
Depreciation, depletion and amortization | $ 3,400 | $ 2,500 | $ 9,700 | $ 7,100
Capital expenditures | $ 1,900 | $ 12,600 | $ 17,600 | $ 36,100
Other and Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Cost of products sold | $ 900 | $ 500 | $ 2,900 | $ 2,900
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ (900) | $ (500) | $ (2,900) | $ (2,900)
SG&A | 12,400 | 13,800 | 39,800 | 41,700
(Gains) losses on dispositions of plant, equipment and timberlands, net | (200) | (100) | (1,900) | (200)
Operating income (loss) | (13,100) | (14,200) | (40,800) | (44,400)
Non-operating expense | (1,600) | (3,700) | (9,900) | (10,400)
Income (loss) before income taxes | (14,700) | (17,900) | (50,700) | (54,800)
Supplementary Data |  |  |  |
Depreciation, depletion and amortization | 1,000 | 600 | 3,300 | 2,300
Capital expenditures | $ 1,300 | $ 4,600 | $ 3,700 | $ 11,300

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