Shareholders' Equity - Additional Information (Detail) - $ / shares
 3 Months Ended 6 Months Ended
Mar. 21, 2014
Jan. 22, 2010
Jan. 20, 2010
May. 31, 2014
May. 31, 2015
May. 31, 2014
Nov. 30, 2014
Nov. 06, 2006
Equity [Line Items]                
Common shares, shares authorized         250,000,000   250,000,000  
Common shares, shares outstanding         55,416,986   55,397,320  
Employee Stock Option                
Equity [Line Items]                
Stock issued, options and RSUs         567,500 45,000    
Restricted Stock Units (RSUs)                
Equity [Line Items]                
Stock issued, options and RSUs         242,000 15,000    
Series A Preferred Stock                
Equity [Line Items]                
Series A Mandatorily Redeemable Preferred Stock redeemed, shares 26,000     26,000        
API                
Equity [Line Items]                
Common shares, shares outstanding         63,886      
Exchangeable share outstanding         22,617      
API | Exchangeable Shares                
Equity [Line Items]                
Common shares, shares authorized               2,354,505
Equity Based Compensation                
Equity [Line Items]                
Share authorized     800,000          
Shares available for issuance     550,000          
Common stock issued     250,000          
Common shares issued in escrow     126,250          
Common Stock | Equity Based Compensation                
Equity [Line Items]                
Warrants issued, shares of common stock to purchase by warrant   892,862 892,862          
Warrants issued, exercise price   $ 5.60 $ 5.60          
Warrants expiry date   Jan. 22, 2015 Jan. 20, 2015          
First Anniversary | Equity Based Compensation                
Equity [Line Items]                
Shares available for issuance     250,000          
Second Anniversary | Equity Based Compensation                
Equity [Line Items]                
Shares available for issuance     300,000