Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Plan - Additional Information (Detail)

v3.10.0.1
Share Repurchase Plan - Additional Information (Detail) - $ / shares
9 Months Ended
Aug. 31, 2018
Aug. 31, 2018
Aug. 31, 2017
Nov. 30, 2017
Oct. 06, 2016
Apr. 08, 2015
Jun. 06, 2012
Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]                
Number of shares authorized to repurchase         8,000,000 6,000,000 3,000,000 1,000,000
Share repurchase plan   Open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission            
Treasury stock, shares 5,801,086 5,801,086   5,801,086        
Common Stock [Member]                
Equity, Class of Treasury Stock [Line Items]                
Treasury stock, shares 5,801,086 5,801,086            
Repurchase agreement, purchase price per share $ 3.37 $ 0.00 $ 5.14          
Number of shares repurchased   0 86,915