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Significant Accounting Policies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Line Items]      
Percentage of tuition revenue in total revenue 96.00%    
Tuition receivable included in other assets $ 3,400,000    
Depreciation and amortization on property and equipment $ 35,563,000 $ 23,973,000 $ 21,525,000
Common stock, shares authorized 20,000,000 20,000,000  
Common stock, par value $ 0.01 $ 0.01  
Common stock, shares issued 10,797,464 11,387,299  
Common stock, shares outstanding 10,797,464 11,387,299  
Preferred stock, shares authorized 8,000,000    
Preferred stock, shares issued       
Preferred stock, shares outstanding       
Income tax description Upon determination, uncertain tax positions are measured to determine the amount of benefit that is greater than 50% likely to be realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. A tax position is derecognized if it no longer meets the more likely than not threshold of being sustained.    
Issued and outstanding of stock options       8,000
Minimum [Member]
      
Significant Accounting Policies [Line Items]      
Estimated useful life of property and equipment 3 years    
Maximum [Member]
      
Significant Accounting Policies [Line Items]      
Estimated useful life of property and equipment 40 years