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Business Acquisition - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
May 02, 2012
Dec. 01, 2011
Business Acquisition [Line Items]      
Income (expense) associated with this acquisition $ 700,000    
Cost of acquired entity   3,100,000  
Goodwill associated with this acquisition 2,900,000    
Purchase price of Everblue Training Institute     9,800,000
Estimated aggregate earnout payment 1,600,000    
Everblue [Member]
     
Business Acquisition [Line Items]      
Goodwill associated with this acquisition     $ 8,853,000
Number of educational sessions conducted in U.S. cities     70
Number of educational sessions conducted in international locations     7