Segment Information - Schedule of Financial and Other Information by Segment (Detail) T in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) T	Mar. 31, 2020 USD ($) T
Segment Reporting Information [Line Items]
Net sales	$ 225,674	$ 231,560
Type of Revenue [Extensible List]	Product [Member]	Product [Member]
Cost of products sold	$ 186,378	$ 194,685
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]
Gross profit	$ 39,296	$ 36,875
SG&A	22,827	24,594
Gains on dispositions of plant, equipment and timberlands, net	(850)
Operating income	17,319	12,281
Non-operating expense	(1,735)	(2,267)
Income from continuing operations before income taxes	$ 15,584	$ 10,014
Supplementary Data
Net tons sold | T	63,004	71,022
Depreciation, depletion and amortization	$ 13,733	$ 15,402
Capital expenditures	5,379	7,014
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	141,249	$ 132,711
Type of Revenue [Extensible List]		Product [Member]
Cost of products sold	114,267	$ 106,985
Type of Cost, Good or Service [Extensible List]		Product [Member]
Gross profit	26,982	$ 25,726
SG&A	10,917	10,624
Operating income	16,065	15,102
Income from continuing operations before income taxes	$ 16,065	$ 15,102
Supplementary Data
Net tons sold | T	34,140	35,983
Depreciation, depletion and amortization	$ 6,981	$ 6,466
Capital expenditures	2,773	3,956
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 84,425	$ 98,849
Type of Revenue [Extensible List]	Product [Member]	Product [Member]
Cost of products sold	$ 72,585	$ 82,246
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]
Gross profit	$ 11,840	$ 16,603
SG&A	4,643	4,581
Operating income	7,197	12,022
Income from continuing operations before income taxes	$ 7,197	$ 12,022
Supplementary Data
Net tons sold | T	28,864	35,039
Depreciation, depletion and amortization	$ 5,848	$ 5,451
Capital expenditures	$ 1,739	$ 2,103
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]	Product [Member]	Product [Member]
Cost of products sold	$ (474)	$ 5,454
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]
Gross profit	$ 474	$ (5,454)
SG&A	7,267	9,389
Gains on dispositions of plant, equipment and timberlands, net	(850)
Operating income	(5,943)	(14,843)
Non-operating expense	(1,735)	(2,267)
Income from continuing operations before income taxes	(7,678)	(17,110)
Supplementary Data
Depreciation, depletion and amortization	904	3,485
Capital expenditures	$ 867	$ 955