Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets [Line Items]
Operating lease payment due	$ 9,270,000
Operating Leases, Rent Expense	4,000,000	4,400,000	3,400,000
Yadkinville North Carolina [Member]
Operating Leased Assets [Line Items]
Operating lease payment due	1,900,000
Yadkinville North Carolina [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	300,000
Yadkinville North Carolina [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	400,000
Equipment [Member] | Thermal Acoustical Fibers Segments [Member]
Operating Leased Assets [Line Items]
Operating lease payment due	4,500,000
Equipment [Member] | Minimum [Member] | Thermal Acoustical Fibers Segments [Member]
Operating Leased Assets [Line Items]
Operating lease payment due	700,000
Equipment [Member] | Maximum [Member] | Thermal Acoustical Fibers Segments [Member]
Operating Leased Assets [Line Items]
Operating lease payment due	$ 1,000,000