Quarterly report pursuant to Section 13 or 15(d)

Income (Loss) Per Common Share - Additional Information (Detail)

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Income (Loss) Per Common Share - Additional Information (Detail) (Employee Stock Incentive Plan [Member])
3 Months Ended 9 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Employee Stock Incentive Plan [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of outstanding options excluded from computation of diluted earnings per share 588,000 1,151,077 511,000 1,151,077