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Business Acquisitions - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2012
Sep. 30, 2012
May 02, 2012
Dec. 01, 2011
Business Acquisition [Line Items]        
Cost of acquired entity     $ 3,100,000  
Goodwill associated with this acquisition   2,900,000   8,853,000
Purchase price of Everblue Training Institute       9,800,000
Estimated aggregate earnout payment   1,600,000    
Compensation expense recognized $ 1,300,000      
Everblue [Member]
       
Business Acquisition [Line Items]        
Number of educational sessions conducted in U.S. cities       70
Number of educational sessions conducted in international locations       7