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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Property
Dec. 31, 2011
Dec. 31, 2010
Derivative [Line Items]                
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        
Reduced pledge collateral   555       225 555  
Note receivable from a financial institution at fair market value           27,000    
Interest rate on notes           11.00%    
Interest rate on loan           6.00%    
Default rate           5.00%    
Property leased           1    
Collateralized properties           4    
Capitalized interest rate on borrowings to finance improvements           2.20% 2.30% 3.10%
Property and Equipment, Useful Life           15 years    
Lease termination fee payable to old landlord   1,093            
Lease termination costs   (140) 922         782  
Prepaid maintenance and service fees   4,900         4,900  
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    
Agreement to pay former owner royalty amount 22,500              
Settlement of future royalty payment obligation 5,920              
Royalty amortization period 20 years              
Fair value of the shares issued of the license agreement           3,394    
Accrued liability related to royalty arrangement   231       246 231  
Discount net cash flows           35.00%    
Reserve for uncertain tax positions including interest and penalties   543       0 543  
Reduction in revenue due to scholarships offered to students           94,283 73,612 55,833
Percent of financial aid earn by student           100.00%    
Period for write off inactive student accounts     150 days          
Costs incurred due to unanticipated delays in information processing               4,013
Advertising costs           51,023 45,587 35,550
Payment made under the agreement             8,500  
Expenses relating to this agreement               9,233
Arrangement expense           2,328 877 7,694
Due to related parties   227       523 227  
Mind Streams [Member]
                
Derivative [Line Items]                
Due to related parties   $ 212       $ 523 $ 212  
Furniture, fixtures and equipment [Member]
                
Derivative [Line Items]                
Property and Equipment, Useful Life             10 years  
Computer equipment [Member]
                
Derivative [Line Items]                
Property and Equipment, Useful Life             4 years  
Vehicles [Member]
                
Derivative [Line Items]                
Property and Equipment, Useful Life             5 years  
Land improvements and buildings [Member] | Maximum [Member]
                
Derivative [Line Items]                
Property and Equipment, Useful Life             40 years  
Land improvements and buildings [Member] | Minimum [Member]
                
Derivative [Line Items]                
Property and Equipment, Useful Life             10 years