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Assets Held for Sale - Summary of Assets Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets Held For Sale [Line Items]    
Total Assets Held for Sale $ 1,965 $ 6,649
Byron Center facility [Member]
   
Assets Held For Sale [Line Items]    
Total Assets Held for Sale   4,444
River Grove facility [Member]
   
Assets Held For Sale [Line Items]    
Total Assets Held for Sale 1,535 1,775
Neenah land [Member]
   
Assets Held For Sale [Line Items]    
Total Assets Held for Sale $ 430 $ 430