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Summary of Significant Accounting Policies (Details Textual) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2009
Apr. 30, 2008
Dec. 31, 2011
acre
Sep. 30, 2011
Dec. 31, 2011
Y
acre
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Jan. 29, 2004
Derivative Contract Details (Textual) [Abstract]                  
Deferred gain $ 1,429                
Due to related parties     227   227 9,471      
Property, Plant and Equipment [Line Items]                  
Land improvements and buildings, Useful Life, Minimum         15        
Summary of Significant Accounting Policies (Textual) [Abstract]                  
Goodwill     2,941   2,941 2,941     2,941
Common stock acquired 909                
Aggregate Purchase Price 50,000                
Borrow to Finance Purchases 25,675                
Paid for repurchase common stock 14,495           14,495    
Paid for land and building 35,505                
Capital lease obligation 30,020           30,020    
Deferred gain 1,429                
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents         60 to 90 Days        
Amount agreed to pay to settle the qui tam matter as restricted cash               5,200  
Pledged collateral as noncurrent restricted cash           760      
Reduced pledge collateral     555   555        
Capitalized interest rate on borrowing to finance improvement         2.30% 3.10% 5.40%    
Lease termination fee payable to old landlord     1,093            
Lease termination costs     (140) 922 782        
Leasehold improvement expense     0            
Capital Expenditure Paid Related to Deferred Loan Cost     408   408        
Accumulated amortization     180   180 105      
Interest expense on derivatives related to credit risk         1        
Area of the Company's campus in Phoenix, Arizona     115   115        
Percent of financial aid earn by student         100.00%        
Period for write off inactive student accounts       150 days          
Reduction in revenue due to scholarships offered to students         73,612 55,833 34,155    
Collaboration agreement cost           8,500      
Arrangement expense         877 7,694 6,736    
Prepaid maintenance and service fees for an aggregate amount     4,900   4,900        
Prepaid maintenance and service fees     4,900   4,900        
Agreement to pay former owner royalty amount   22,500              
Settlement of future royalty payment obligation   5,920              
Agreement period of Acquired source code rights for the software developed, prepaid maintenance and service fee         7 years        
Amortization of other current assets         Next twelve month cycle        
Royalty Amortization period   20 years              
Reclassification of net loss on interest rate corridor     92   92        
Fair value of the shares issued of the license agreement         3,394        
Accrued liability related to royalty arrangement     231   231 875      
Reserve for uncertain tax positions including interest and penalties     543   543 388      
Costs incurred due to unanticipated delays in information processing           4,013      
Advertising costs         45,587 35,550 24,820    
Expenses relating to this agreement           9,233      
Furniture, fixtures and equipment [Member]
                  
Property, Plant and Equipment [Line Items]                  
Property and Equipment, Useful Life         10        
Computer equipment [Member]
                  
Property, Plant and Equipment [Line Items]                  
Property and Equipment, Useful Life         4        
Vehicle estimated useful life [Member]
                  
Property, Plant and Equipment [Line Items]                  
Property and Equipment, Useful Life         5        
Land improvements and buildings [Member]
                  
Property, Plant and Equipment [Line Items]                  
Land improvements and buildings, Useful Life, Minimum         10        
Land improvements and buildings, Useful Life, Maximum         40        
Summary of Significant Accounting Policies (Textual) [Abstract]                  
Land improvements and buildings, Useful Life, Maximum         40        
Mind Streams [Member]
                  
Derivative Contract Details (Textual) [Abstract]                  
Due to related parties     $ 212   $ 212 $ 9,367