Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill – Composite Fibers	$ 73,094	$ 76,056
Total intangibles	82,549	85,858
Accumulated amortization	(26,290)	(22,801)
Net intangibles	56,259	63,057
Specialty Papers [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	6,155	6,155
Composite Fibers [Member] | Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	4,195	4,332
Composite Fibers [Member] | Technology and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	35,874	37,625
Composite Fibers [Member] | Customer Relationships and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	32,310	33,618
Advanced Airlaid Materials [Member] | Technology and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	1,377	1,403
Advanced Airlaid Materials [Member] | Customer Relationships and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	$ 2,638	$ 2,725