Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Reporting Unit) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning Balance	$ 16,841	$ 21,943
Goodwill adjustment	47,987	(4,660)
Currency translation adjustment	(1,222)	(442)
Ending Balance	63,606	16,841
Performance Materials
Goodwill [Roll Forward]
Beginning Balance	12,898	13,340
Goodwill adjustment	0	0
Currency translation adjustment	(121)	(442)
Ending Balance	12,777	12,898
Technical Nonwovens
Goodwill [Roll Forward]
Beginning Balance	3,943	3,943
Goodwill adjustment	47,987	0
Currency translation adjustment	(1,101)	0
Ending Balance	50,829	3,943
Other Products and Services
Goodwill [Roll Forward]
Beginning Balance	0	4,660
Goodwill adjustment	0	(4,660)
Currency translation adjustment	0	0
Ending Balance	$ 0	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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