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Segment Information (Net Sales By Segment) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Net sales $ 397,969 $ 378,924 $ 383,588
Eliminations and Other (3,933) (4,321) (2,824)
Performance Materials Segment [Member]
     
Segment Reporting Information [Line Items]      
Net sales 112,001 118,035 134,059
Performance Materials Segment [Member] | Industrial Filtration
     
Segment Reporting Information [Line Items]      
Net sales 64,752 68,379 72,888
Performance Materials Segment [Member] | Industrial Thermal Insulation
     
Segment Reporting Information [Line Items]      
Net sales 36,929 38,449 47,299
Performance Materials Segment [Member] | Life Sciences Filtration
     
Segment Reporting Information [Line Items]      
Net sales 10,320 11,207 13,872
Other Products and Services Segment [Member]
     
Segment Reporting Information [Line Items]      
Net sales 17,175 16,853 14,670
Other Products and Services Segment [Member] | Life Sciences Vital Fluids
     
Segment Reporting Information [Line Items]      
Net sales 17,175 16,853 14,670
Thermal Acoustical Fibers Segments [Member]
     
Segment Reporting Information [Line Items]      
Net sales 114,320 94,436 81,747
Thermal Acoustical Fibers Segments [Member] | Fiber Parts
     
Segment Reporting Information [Line Items]      
Net sales 105,876 93,519 79,631
Thermal Acoustical Fibers Segments [Member] | Tooling
     
Segment Reporting Information [Line Items]      
Net sales 8,444 917 2,116
Thermal Acoustical Metals Segments [Member]
     
Segment Reporting Information [Line Items]      
Net sales 158,406 153,921 155,936
Thermal Acoustical Metals Segments [Member] | Metal Parts
     
Segment Reporting Information [Line Items]      
Net sales 135,833 136,276 142,646
Thermal Acoustical Metals Segments [Member] | Tooling
     
Segment Reporting Information [Line Items]      
Net sales $ 22,573 $ 17,645 $ 13,290