Segment Information (Detail 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	[1]	Sep. 30, 2014	[2]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	$ 14,841	$ 5,779	$ 41,948		$ 25,978
Performance Materials [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	2,500	2,272	6,071		7,701
Industrial Filtration [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	3,352	1,833	11,058		4,817
Thermal/Acoustical Metals Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	3,889	4,267	12,323		10,484
Thermal/Acoustical Fibers Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	10,082	6,911	27,719		23,531
Other Products and Services [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	0	537	118		1,243
Corporate Office Expenses [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	$ (4,982)	$ (10,041)	$ (15,341)		$ (21,798)

[1] Other Products and Services reports results for the period preceding the date of disposition of January 30, 2015.

[2] Industrial Filtration segment reports results for the period following the date of acquisition of February 20, 2014 through September 30, 2014.