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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Jan. 30, 2016
Oct. 28, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]                
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents   60 to 90 days            
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%            
Interest income and other income on the loan   $ 2,187   $ 1,459        
Default interest amount   432            
Late payment liquidated damage amount   1,392            
Statutory trustee's fee amount   $ 139            
Additional amount deposited in escrow             $ 344  
Date of order for late payment liquidated damage amount   Oct. 28, 2013            
Other income   $ 958            
Capitalized interest rate on borrowings to finance improvements   1.90% 1.90% 1.90%        
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            
Discount net cash flows   35.00%            
Reserve for uncertain tax positions including interest and penalties   $ 1,706 $ 0          
Description of area of the company's campus in Phoenix, Arizona   200+ acre campus            
Reduction in revenue due to scholarships offered to students   $ 163,893 $ 139,962 $ 111,789        
Period for write off of inactive student accounts   150 days            
Other Assets [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, useful life   15 years            
Prepaid maintenance and service fees         $ 4,900      
Amortization of other current assets   Next twelve month            
Subsequent Event [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Default interest and other fees payable           $ 501    
Furniture, Fixtures and Equipment [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, useful life   10 years            
Computer Equipment [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, useful life   4 years            
Vehicles [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, useful life   5 years            
Minimum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents   60 days            
Minimum [Member] | Other Assets [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Agreement period of acquired source code rights for the software developed, prepaid maintenance and service fee         7 years      
Minimum [Member] | Land Improvements and Buildings [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, useful life   10 years            
Maximum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents   90 days            
Maximum [Member] | Land Improvements and Buildings [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, useful life   40 years