Segment Information - Schedule of Financial and Other Information by Segment (Detail) T in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) T	Mar. 31, 2019 USD ($) T
Segment Reporting Information [Line Items]
Net sales	$ 231,560	$ 229,133
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 194,685	$ 193,516
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 36,875	$ 35,617
SG&A	24,594	24,622
Gains on dispositions of plant, equipment and timberlands, net		(669)
Operating income	12,281	11,664
Non-operating expense	(2,267)	(5,203)
Income from continuing operations before income taxes	$ 10,014	$ 6,461
Supplementary Data
Net tons sold | T	71,022	64,706
Depreciation, depletion and amortization	$ 15,402	$ 12,788
Capital expenditures	7,014	5,865
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	$ 132,711	$ 128,717
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 106,985	$ 106,563
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 25,726	$ 22,154
SG&A	10,624	10,805
Operating income	15,102	11,349
Income from continuing operations before income taxes	$ 15,102	$ 11,349
Supplementary Data
Net tons sold | T	35,983	31,529
Depreciation, depletion and amortization	$ 6,466	$ 6,674
Capital expenditures	3,956	3,188
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 98,849	$ 100,416
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 82,246	$ 85,989
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 16,603	$ 14,427
SG&A	4,581	4,389
Operating income	12,022	10,038
Income from continuing operations before income taxes	$ 12,022	$ 10,038
Supplementary Data
Net tons sold | T	35,039	33,177
Depreciation, depletion and amortization	$ 5,451	$ 5,268
Capital expenditures	$ 2,103	$ 2,192
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 5,454	$ 964
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ (5,454)	$ (964)
SG&A	9,389	9,428
Gains on dispositions of plant, equipment and timberlands, net		(669)
Operating income	(14,843)	(9,723)
Non-operating expense	(2,267)	(5,203)
Income from continuing operations before income taxes	(17,110)	(14,926)
Supplementary Data
Depreciation, depletion and amortization	3,485	846
Capital expenditures	$ 955	$ 485