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Valdosta Mill Fire Insurance Recovery - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
T
Dec. 31, 2011
Unusual or Infrequent Item [Line Items]    
Sale volume losses, in tons 11,000  
Insurance deductible   $ 3.0
Insurance claim, net of deductible   9.4
Received additional insurance proceeds for capital expenditures $ 1.4