Quarterly report pursuant to Section 13 or 15(d)

Income per Common Share - Additional Information (Detail)

v2.4.1.9
Income per Common Share - Additional Information (Detail) (Stock Option [Member])
3 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Stock Option [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of outstanding options excluded from computation of diluted earnings per share 271,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
551,334us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember