Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Program - Additional Information (Detail)

v2.4.0.8
Stock Repurchase Program - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2014
May 31, 2014
Sep. 04, 2013
Equity [Abstract]        
Stock repurchase program, authorized amount       $ 25,000,000
Termination date of repurchase program   Jan. 31, 2015    
Increase in stock repurchase program authorized amount     40,000,000  
Extended Termination date of repurchase program   Apr. 30, 2015    
Stock repurchased during period, Shares 0 591,520    
Common stock average price   $ 9.31    
Payments for repurchase including fee   (5,504,000)    
Remaining shares available under authorized share repurchase $ 34,500,000 $ 34,500,000