Segment and Geographic Information - Schedule of Financial and Other Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 235,282	$ 233,473	$ 216,183	$ 231,560	$ 230,972	$ 232,515	$ 235,053	$ 229,133	$ 916,498	$ 927,673	$ 866,286
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold									$ 768,629	$ 780,131	$ 735,879
Type of Cost, Good or Service [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 40,753	$ 38,251	$ 32,063	$ 36,802	$ 36,404	$ 38,021	$ 37,500	$ 35,617	$ 147,869	$ 147,542	$ 130,407
SG&A									100,045	94,967	111,721
Gains (Loss) on dispositions of plant, equipment and timberlands, net									(1,332)	(2,060)	(3,256)
Operating income									49,156	54,635	21,942
Non-operating expense									(16,797)	(89,088)	(14,667)
Income (loss) before income taxes									32,359	(34,453)	7,275
Supplementary Data
Plant, equipment and timberlands, net	543,267				537,421				543,267	537,421	556,044
Depreciation, depletion and amortization									56,600	50,820	47,525
Capital expenditures									28,136	27,765	42,129
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales									$ 525,089	$ 521,666	$ 554,869
Type of Revenue [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold									$ 430,420	$ 432,154	$ 462,270
Type of Cost, Good or Service [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit									$ 94,669	$ 89,512	$ 92,599
SG&A									42,575	41,629	44,205
Operating income									52,094	47,883	48,394
Income (loss) before income taxes									52,094	47,883	48,394
Supplementary Data
Plant, equipment and timberlands, net	225,444				222,710				225,444	222,710	233,167
Depreciation, depletion and amortization									26,175	26,153	28,256
Capital expenditures									13,262	11,972	15,685
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales									$ 391,409	$ 406,007	$ 311,417
Type of Revenue [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold									$ 326,809	$ 346,568	$ 269,272
Type of Cost, Good or Service [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit									$ 64,600	$ 59,439	$ 42,145
SG&A									18,296	18,321	12,182
Operating income									46,304	41,118	29,963
Income (loss) before income taxes									46,304	41,118	29,963
Supplementary Data
Plant, equipment and timberlands, net	295,806				293,779				295,806	293,779	298,232
Depreciation, depletion and amortization									22,416	21,136	14,892
Capital expenditures									$ 9,311	$ 13,667	$ 21,646
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold									$ 11,400	$ 1,409	$ 4,337
Type of Cost, Good or Service [Extensible List]									us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit									$ (11,400)	$ (1,409)	$ (4,337)
SG&A									39,174	35,017	55,334
Gains (Loss) on dispositions of plant, equipment and timberlands, net									(1,332)	(2,060)	(3,256)
Operating income									(49,242)	(34,366)	(56,415)
Non-operating expense									(16,797)	(89,088)	(14,667)
Income (loss) before income taxes									(66,039)	(123,454)	(71,082)
Supplementary Data
Plant, equipment and timberlands, net	$ 22,017				$ 20,932				22,017	20,932	24,645
Depreciation, depletion and amortization									8,009	3,531	4,377
Capital expenditures									$ 5,563	$ 2,126	$ 4,798