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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 2 Months Ended 12 Months Ended
Oct. 31, 2010
Dec. 31, 2012
acre
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Commitments And Contingencies [Line Items]        
Authorized capital commitments   $ 27.0 $ 40.4  
Area leased under timberland cutting rights (acres)   88,000    
Total lease expense   49.4 46.1 42.0
Capital lease obligations   25.9 21.8  
Purchase commitments term, years   Periods ranging from one to 16 years    
Purchase commitments, amount   27.7 28.5 32.8
Number of lawsuits filed by the plaintiffs 5      
Number of other U.S. and Canadian containerboard producers PCA and eight other U.S. and Canadian containerboard producers were named as defendants      
Remediation costs   3.2    
Environmental reserve   11.7    
Capital Lease Obligations
        
Schedule Of Commitments And Contingencies [Line Items]        
Interest paid, capital lease obligations   $ 1.7 $ 1.5 $ 1.6
Operating Leases
        
Schedule Of Commitments And Contingencies [Line Items]        
Lease term, years   Lease terms range from one to 11 years