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Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Goodwill - Composite Fibers $ 95,948 $ 16,601
Total intangibles 109,837 17,271
Accumulated amortization (13,756) (8,970)
Net intangibles 96,081 8,301
Specialty Papers [Member] | Customer Relationships [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Total intangibles 6,155 6,155
Composite Fibers [Member] | Tradename [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Total intangibles 10,325  
Composite Fibers [Member] | Technology and Related [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Total intangibles 46,038 4,365
Composite Fibers [Member] | Customer Relationships and Related [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Total intangibles 42,251 1,872
Advanced Airlaid Materials [Member] | Technology and Related [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Total intangibles 1,623 1,579
Advanced Airlaid Materials [Member] | Customer Relationships and Related [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Total intangibles $ 3,445 $ 3,300