Segment Information - Schedule of Financial and Other Information by Segment (Detail) T in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) T	Jun. 30, 2019 USD ($) T	Jun. 30, 2020 USD ($) T	Jun. 30, 2019 USD ($) T
Segment Reporting Information [Line Items]
Net sales	$ 216,183	$ 235,053	$ 447,743	$ 464,186
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 184,120	$ 197,553	$ 378,878	$ 391,069
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 32,063	$ 37,500	$ 68,865	$ 73,117
SG&A	23,551	22,800	48,072	47,422
Gains on dispositions of plant, equipment and timberlands, net	(597)	(423)	(597)	(1,092)
Operating income	9,109	15,123	21,390	26,787
Non-operating expense	(8,837)	(3,175)	(11,104)	(8,378)
Income from continuing operations before income taxes	$ 272	$ 11,948	$ 10,286	$ 18,409
Supplementary Data
Net tons sold | T	62,309	68,564	133,332	133,270
Depreciation, depletion and amortization	$ 14,206	$ 12,732	$ 29,608	$ 25,520
Capital expenditures	4,997	4,768	12,011	10,633
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	$ 122,137	$ 132,581	$ 254,848	$ 261,298
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 100,387	$ 109,565	$ 207,372	$ 216,128
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 21,750	$ 23,016	$ 47,476	$ 45,170
SG&A	10,263	10,031	20,887	20,837
Operating income	11,487	12,985	26,589	24,333
Income from continuing operations before income taxes	$ 11,487	$ 12,985	$ 26,589	$ 24,333
Supplementary Data
Net tons sold | T	29,032	34,523	65,015	66,052
Depreciation, depletion and amortization	$ 6,431	$ 6,601	$ 12,897	$ 13,275
Capital expenditures	2,105	1,516	6,061	4,704
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 94,046	$ 102,472	$ 192,895	$ 202,888
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 77,581	$ 87,825	$ 159,827	$ 173,814
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 16,465	$ 14,647	$ 33,068	$ 29,074
SG&A	4,173	4,285	8,754	8,674
Operating income	12,292	10,362	24,314	20,400
Income from continuing operations before income taxes	$ 12,292	$ 10,362	$ 24,314	$ 20,400
Supplementary Data
Net tons sold | T	33,277	34,041	68,316	67,218
Depreciation, depletion and amortization	$ 5,473	$ 5,279	$ 10,924	$ 10,547
Capital expenditures	$ 1,712	$ 2,821	$ 3,815	$ 5,013
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	$ 6,152	$ 163	$ 11,679	$ 1,127
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ (6,152)	$ (163)	$ (11,679)	$ (1,127)
SG&A	9,115	8,484	18,431	17,911
Gains on dispositions of plant, equipment and timberlands, net	(597)	(423)	(597)	(1,092)
Operating income	(14,670)	(8,224)	(29,513)	(17,946)
Non-operating expense	(8,837)	(3,175)	(11,104)	(8,378)
Income from continuing operations before income taxes	(23,507)	(11,399)	(40,617)	(26,324)
Supplementary Data
Depreciation, depletion and amortization	2,302	852	5,787	1,698
Capital expenditures	$ 1,180	$ 431	$ 2,135	$ 916