Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Plan - Additional Information (Detail)

v3.21.1
Share Repurchase Plan - Additional Information (Detail) - $ / shares
3 Months Ended 111 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Nov. 30, 2020
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 6,093,535        
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          
Number of shares repurchased 0 0