Segment Information - Schedule of Financial and Other Information by Segment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) T	Sep. 30, 2018 USD ($) T	Sep. 30, 2019 USD ($) T	Sep. 30, 2018 USD ($) T
Segment Reporting Information [Line Items]
Net sales	$ 232,515	$ 209,855	$ 696,701	$ 636,806
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 194,494	$ 179,983	$ 585,563	$ 537,073
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 38,021	$ 29,872	$ 111,138	$ 99,733
SG&A	23,721	25,799	71,143	81,915
Gains on dispositions of plant,equipment and timberlands, net	(235)	(249)	(1,327)	(1,939)
Operating income	14,535	4,322	41,322	19,757
Non-operating expense	(2,751)	(1,565)	(11,129)	(9,879)
Income from continuing operations before income taxes	$ 11,784	$ 2,757	$ 30,193	$ 9,878
Supplementary Data
Net tons sold | T	69,300	61,500	202,600	182,800
Depreciation, depletion and amortization	$ 12,600	$ 11,500	$ 38,114	$ 34,731
Capital expenditures	7,400	6,200	18,000	32,200
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	127,704	$ 139,176	389,002	$ 423,707
Type of Revenue [Extensible List]		us-gaap:ProductMember		us-gaap:ProductMember
Cost of products sold	106,000	$ 116,800	322,200	$ 349,500
Type of Cost, Good or Service [Extensible List]		us-gaap:ProductMember		us-gaap:ProductMember
Gross profit	21,700	$ 22,400	66,800	$ 74,200
SG&A	10,600	10,500	31,400	34,000
Operating income	11,100	11,900	35,400	40,200
Income from continuing operations before income taxes	$ 11,100	$ 11,900	$ 35,400	$ 40,200
Supplementary Data
Net tons sold | T	33,400	37,400	99,400	110,400
Depreciation, depletion and amortization	$ 6,400	$ 7,100	$ 19,700	$ 21,700
Capital expenditures	4,000	3,000	8,700	10,900
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 104,811	$ 70,679	$ 307,699	$ 213,099
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 88,400	$ 62,300	$ 262,300	$ 184,700
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 16,400	$ 8,400	$ 45,400	$ 28,400
SG&A	4,800	2,900	13,400	8,100
Operating income	11,600	5,500	32,000	20,300
Income from continuing operations before income taxes	$ 11,600	$ 5,500	$ 32,000	$ 20,300
Supplementary Data
Net tons sold | T	35,900	24,000.0	103,100	72,400
Depreciation, depletion and amortization	$ 5,300	$ 3,400	$ 15,800	$ 9,700
Capital expenditures	$ 2,900	$ 1,900	$ 7,900	$ 17,600
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	$ 100	$ 900	$ 1,100	$ 2,800
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ (100)	$ (900)	$ (1,100)	$ (2,800)
SG&A	8,300	12,400	26,300	39,800
Gains on dispositions of plant,equipment and timberlands, net	(200)	(200)	(1,300)	(1,900)
Operating income	(8,200)	(13,100)	(26,100)	(40,800)
Non-operating expense	(2,800)	(1,600)	(11,100)	(9,900)
Income from continuing operations before income taxes	(11,000)	(14,700)	(37,200)	(50,700)
Supplementary Data
Depreciation, depletion and amortization	900	1,000	2,600	3,300
Capital expenditures	$ 500	$ 1,300	$ 1,400	$ 3,700