Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Total Goodwill	$ 150,816	$ 153,463
Total intangibles	123,587	125,799
Accumulated amortization	(39,852)	(32,185)
Net intangibles	83,735	93,614
Composite Fibers [Member]
Finite-Lived Intangible Assets [Line Items]
Total Goodwill	77,775	79,024
Composite Fibers [Member] | Technology and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	38,256	38,813
Composite Fibers [Member] | Tradename Nonamortizing
Finite-Lived Intangible Assets [Line Items]
Total intangibles	4,470	4,556
Composite Fibers [Member] | Customer Relationships and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	34,445	35,029
Airlaid Materials [Member]
Finite-Lived Intangible Assets [Line Items]
Total Goodwill	73,041	74,439
Airlaid Materials [Member] | Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	3,625	4,534
Airlaid Materials [Member] | Technology and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	18,406	18,014
Airlaid Materials [Member] | Customer Relationships and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	$ 24,385	$ 24,853