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Subsequent Events - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended 1 Months Ended
Sep. 30, 2013
T
Sep. 30, 2012
Dec. 31, 2012
Boise Incorporation
Sep. 30, 2013
Boise Incorporation
Oct. 25, 2013
Subsequent Event
T
Oct. 25, 2013
Subsequent Event
Boise Incorporation
Oct. 25, 2013
Subsequent Event
Boise Incorporation
Term LoanA Facility
Oct. 25, 2013
Subsequent Event
Boise Incorporation
4.50% notes
Subsequent Event [Line Items]                
Net sales reported by acquired entity for last fiscal year     $ 2,600,000,000          
Business acquisition common shares outstanding, per share           $ 12.55    
Business acquisition, outstanding indebtedness           775,000,000    
Business combination, transaction value           1,940,000,000    
Business acquisition, transaction cost       4,200,000        
Senior notes, redemption premium   (21,296,000)       55,700,000    
New borrowings           $ 2,000,000,000 $ 1,300,000,000 $ 700.0
Note interest rate               4.50%
Note maturity period               10 years
Estimated production capacity 2,600,000       3,700,000      
Corrugated products volume percentage increase         30.00%