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Authorized Number of Shares of Common Stock - Additional Information (Detail) (USD $)
 1 Months Ended
Mar. 10, 2011
Apr. 17, 1987
Jul. 31, 2012
Jan. 31, 2012
Oct. 31, 2011
Apr. 16, 1987
Nov. 30, 2011
Before Amendment
Oct. 31, 2011
Before Amendment
Nov. 30, 2011
After Amendment
Capital Unit [Line Items]                  
Common stock, authorized   10,000,000 20,000,000 20,000,000 20,000,000 100,000,000 200,000,000 200,000,000 20,000,000
Common stock, par value   $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.001      
Common stock, shares outstanding     6,889,424   7,110,507 29,999,998      
Stock split ratio 2 0.1              
Reduction in number of outstanding shares   3,000,000