Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Plan - Additional Information (Detail)

v3.8.0.1
Share Repurchase Plan - Additional Information (Detail) - $ / shares
1 Months Ended 3 Months Ended
Feb. 28, 2018
Jun. 30, 2015
Feb. 28, 2018
Feb. 28, 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            
Tender offer to purchase common stock price per share   $ 3.25              
Percentage of outstanding common shares purchased under tender offer   7.76%              
Tender offer sales price   $ 2.29              
Treasury stock, shares 5,801,086   5,801,086   5,801,086        
Maximum [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Tender offer to purchase common stock shares   750,000              
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 $ 4.50          
Number of shares repurchased     0 19,729