Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Plan - Additional Information (Detail)

v3.19.2
Share Repurchase Plan - Additional Information (Detail) - $ / shares
6 Months Ended
May 31, 2019
Nov. 30, 2018
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          
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          
Number of shares repurchased 0