Annual report pursuant to Section 13 and 15(d)

Share Repurchase Plan - Additional Information (Detail)

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Share Repurchase Plan - Additional Information (Detail) - $ / shares
12 Months Ended
Nov. 30, 2019
Mar. 31, 2018
Nov. 30, 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 6,093,535   6,093,535 5,801,086        
2012 Stock Incentive Plan [Member]                
Equity, Class of Treasury Stock [Line Items]                
Number of shares repurchased   292,449            
Common Stock [Member]                
Equity, Class of Treasury Stock [Line Items]                
Treasury stock, shares 6,093,535   6,093,535          
Repurchase agreement, purchase price per share $ 3.37   $ 3.39 $ 0.00        
Number of shares repurchased     292,449 0