Segment Information - Schedule of Financial and Other Information by Segment (Detail) T in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) T	Sep. 30, 2019 USD ($) T	Sep. 30, 2020 USD ($) T	Sep. 30, 2019 USD ($) T
Segment Reporting Information [Line Items]
Net sales	$ 233,473	$ 232,515	$ 681,216	$ 696,701
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 195,222	$ 194,494	$ 574,100	$ 585,563
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 38,251	$ 38,021	$ 107,116	$ 111,138
SG&A	24,635	23,721	72,707	71,143
Gains on dispositions of plant, equipment and timberlands, net	(413)	(235)	(1,010)	(1,327)
Operating income	14,029	14,535	35,419	41,322
Non-operating expense	(3,888)	(2,751)	(14,992)	(11,129)
Income from continuing operations before income taxes	$ 10,141	$ 11,784	$ 20,427	$ 30,193
Supplementary Data
Net tons sold | T	69,761	69,301	203,092	202,571
Depreciation, depletion and amortization	$ 13,702	$ 12,594	$ 43,310	$ 38,114
Capital expenditures	8,154	7,384	20,165	18,017
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	$ 132,419	$ 127,704	$ 387,267	$ 389,002
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 112,031	$ 106,024	$ 319,403	$ 322,152
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 20,388	$ 21,680	$ 67,864	$ 66,850
SG&A	9,924	10,551	30,811	31,388
Operating income	10,464	11,129	37,053	35,462
Income from continuing operations before income taxes	$ 10,464	$ 11,129	$ 37,053	$ 35,462
Supplementary Data
Net tons sold | T	35,009	33,394	100,024	99,446
Depreciation, depletion and amortization	$ 6,755	$ 6,445	$ 19,652	$ 19,720
Capital expenditures	3,060	3,995	9,121	8,699
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 101,054	$ 104,811	$ 293,949	$ 307,699
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 83,699	$ 88,442	$ 243,526	$ 262,256
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 17,355	$ 16,369	$ 50,423	$ 45,443
SG&A	4,438	4,774	13,192	13,448
Operating income	12,917	11,595	37,231	31,995
Income from continuing operations before income taxes	$ 12,917	$ 11,595	$ 37,231	$ 31,995
Supplementary Data
Net tons sold | T	34,752	35,907	103,068	103,125
Depreciation, depletion and amortization	$ 5,674	$ 5,285	$ 16,598	$ 15,832
Capital expenditures	$ 2,791	$ 2,869	$ 6,606	$ 7,882
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	$ (508)	$ 28	$ 11,171	$ 1,155
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 508	$ (28)	$ (11,171)	$ (1,155)
SG&A	10,273	8,396	28,704	26,307
Gains on dispositions of plant, equipment and timberlands, net	(413)	(235)	(1,010)	(1,327)
Operating income	(9,352)	(8,189)	(38,865)	(26,135)
Non-operating expense	(3,888)	(2,751)	(14,992)	(11,129)
Income from continuing operations before income taxes	(13,240)	(10,940)	(53,857)	(37,264)
Supplementary Data
Depreciation, depletion and amortization	1,273	864	7,060	2,562
Capital expenditures	$ 2,303	$ 520	$ 4,438	$ 1,436