Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Plan - Additional Information (Detail)

v2.4.0.8
Share Repurchase Plan - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended
May 31, 2014
Nov. 30, 2013
Jun. 06, 2012
Dec. 31, 2011
May 31, 2014
Saneron [Member]
Nov. 30, 2013
Saneron [Member]
May 31, 2014
Common Stock [Member]
May 31, 2013
Common Stock [Member]
Schedule of Share Repurchase Plan [Line Items]                
Number of shares authorized to repurchase     (3,000,000) (1,000,000)        
Number of shares repurchased 1,763,346           636,531 300,391
Average price per share (repurchased) $ 2.18           $ 2.21 $ 2.22
Treasury stock, shares 1,913,446 1,276,915     150,100 150,100    
Shares repurchase plan Open market purchases, Privately negotiated block trades, Unsolicited negotiated transactions, and/or trading plan in accordance with Rule 10b5-1 of the Securities and Exchange Commission              
Common stock additional share repurchased 52,940              
Average price per share additional repurchased $ 2.69