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Preferred Stock - Additional Information (Detail) (USD $)
Nov. 30, 2012
Preferred Stock [Line Items]  
Preferred Stock, Par Value $ 1.00
Preferred Stock, Shares Authorized 10,000,000
Preferred Stock, Issued   
Series B Junior Participating Preferred
 
Preferred Stock [Line Items]  
Preferred Stock, Designated 1,000,000