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Basis of Presentation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
May 31, 2013
May 31, 2013
Schurman [Member]
May 31, 2013
Schurman [Member]
Business trade and other receivables [Member]
May 31, 2013
Schurman [Member]
Investment in equity [Member]
May 31, 2013
Schurman [Member]
Liquidity Guaranty [Member]
May 31, 2013
Schurman [Member]
Operating leases subleased to Schurman [Member]
Feb. 28, 2013
Schurman [Member]
Operating leases subleased to Schurman [Member]
May 25, 2012
Schurman [Member]
Operating leases subleased to Schurman [Member]
Significant Accounting Policies [Line Items]                
Equity interest holdings in Schurman Fine Papers   15.00%            
Maximum exposure to loss, Amount     $ 24.6 $ 1.9 $ 10.0 $ 10.6 $ 11.8 $ 19.0
Number of days under liquidity guaranty         91 days      
End period of Liquidity Guaranty         2016-07      
Total investments in common stock $ 10.8