Segment Information - Schedule of Financial and Other Information by Segment (Detail) T in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) T	Jun. 30, 2020 USD ($) T	Jun. 30, 2021 USD ($) T	Jun. 30, 2020 USD ($) T
Segment Reporting Information [Line Items]
Net sales	$ 244,911	$ 216,183	$ 470,585	$ 447,743
Type of Revenue [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Cost of products sold	$ 209,357	$ 184,120	$ 395,735	$ 378,878
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Gross profit	$ 35,554	$ 32,063	$ 74,850	$ 68,865
SG&A	28,984	23,551	51,811	48,072
Gains on dispositions of plant, equipment and timberlands, net	(1,553)	(597)	(2,403)	(597)
Operating income	8,123	9,109	25,442	21,390
Non-operating expense	(2,610)	(8,837)	(4,345)	(11,104)
Income from continuing operations before income taxes	$ 5,513	$ 272	$ 21,097	$ 10,286
Supplementary Data
Net tons sold | T	68,786	62,309	131,790	133,331
Depreciation, depletion and amortization	$ 14,733	$ 14,206	$ 28,466	$ 29,608
Capital expenditures	5,832	4,997	11,211	12,011
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	$ 141,598	$ 122,137	$ 282,847	$ 254,848
Type of Revenue [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Cost of products sold	$ 119,334	$ 100,387	$ 233,601	$ 207,372
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Gross profit	$ 22,264	$ 21,750	$ 49,246	$ 47,476
SG&A	11,201	10,263	22,118	20,887
Operating income	11,063	11,487	27,128	26,589
Income from continuing operations before income taxes	$ 11,063	$ 11,487	$ 27,128	$ 26,589
Supplementary Data
Net tons sold | T	34,471	29,032	68,611	65,015
Depreciation, depletion and amortization	$ 7,000	$ 6,431	$ 13,981	$ 12,897
Capital expenditures	2,882	2,105	5,655	6,061
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 103,313	$ 94,046	$ 187,738	$ 192,895
Type of Revenue [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Cost of products sold	$ 90,138	$ 77,581	$ 162,723	$ 159,827
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Gross profit	$ 13,175	$ 16,465	$ 25,015	$ 33,068
SG&A	4,744	4,173	9,387	8,754
Operating income	8,431	12,292	15,628	24,314
Income from continuing operations before income taxes	$ 8,431	$ 12,292	$ 15,628	$ 24,314
Supplementary Data
Net tons sold | T	34,315	33,277	63,179	68,316
Depreciation, depletion and amortization	$ 6,767	$ 5,473	$ 12,615	$ 10,924
Capital expenditures	$ 1,297	$ 1,712	$ 3,036	$ 3,815
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Cost of products sold	$ (115)	$ 6,152	$ (589)	$ 11,679
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Gross profit	$ 115	$ (6,152)	$ 589	$ (11,679)
SG&A	13,039	9,115	20,306	18,431
Gains on dispositions of plant, equipment and timberlands, net	(1,553)	(597)	(2,403)	(597)
Operating income	(11,371)	(14,670)	(17,314)	(29,513)
Non-operating expense	(2,610)	(8,837)	(4,345)	(11,104)
Income from continuing operations before income taxes	(13,981)	(23,507)	(21,659)	(40,617)
Supplementary Data
Depreciation, depletion and amortization	966	2,302	1,870	5,787
Capital expenditures	$ 1,653	$ 1,180	$ 2,520	$ 2,135