Segment Information (Detail 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	$ 7,626	[1]	$ 6,517	[1]
Industrial Filtration [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	786	[1]	0	[1]
Performance Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	1,863	[1]	1,277	[1]
Thermal/Acoustical Metals Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	3,653	[1]	3,018	[1]
Thermal/Acoustical Fibers Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	7,341	[1]	6,154	[1]
Other Products and Services
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	420	[1]	356	[1]
Corporate Office Expenses
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	$ (6,437)	[1]	$ (4,288)	[1]

[1] Industrial Filtration segment reports results for the period following the date of acquisition of February 20, 2014 through March 31, 2014.