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Summary of Stock-Based Compensation Expense Related to Common Stock and Common Stock Option Awards (Detail) (USD $)
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Summary Of Stock Based Compensation Expense Related To Common Stock and Common Stock Option Awards [Line Items]    
Stock-based compensation expense $ 2,157,857 $ 2,061,728
Cost of services
   
Summary Of Stock Based Compensation Expense Related To Common Stock and Common Stock Option Awards [Line Items]    
Stock-based compensation expense 616,902 550,710
General and administrative
   
Summary Of Stock Based Compensation Expense Related To Common Stock and Common Stock Option Awards [Line Items]    
Stock-based compensation expense $ 1,540.955 $ 1,511,018