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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
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               $ 27,000,000
Interest rate on notes     11.00%          
Interest rate on loan     6.00%          
Default rate     5.00%          
Interest income and other income on the loan     $ 2,187,000   $ 1,459,000      
Default interest amount $ 432,000   432,000          
Late payment penalty amount 1,392,000   1,392,000          
Statutory trustee's fee amount 139,000   139,000          
Additional amount deposited in escrow 697,000   $ 697,000       $ 344,000  
Date of order for late penalty funds     Oct. 28, 2013          
Default interest and other fees payable 697,000   $ 697,000          
Period of LIBOR interest rate     30 days          
Effective portion of loss on derivative included as a component of other comprehensive income, net of taxes 257,000 $ (61,000) $ 432,000 $ 113,000        
Description of area of the company's campus in Phoenix, Arizona     200+ acre campus          
Reduction in revenue due to scholarships offered to students     $ 114,660,000 $ 96,188,000        
Period for write off of inactive student accounts     150 days          
Cash Flow Hedging [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Effective portion of loss on derivative included as a component of other comprehensive income, net of taxes     $ 699,000          
Other Assets [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Fair values of interest rate corridor instrument 630,000   630,000     $ 1,332,000    
Interest Rate Corridor [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Notional amount of derivative instrument $ 81,667,000   $ 81,667,000          
Description of interest rate risk hedge at several thresholds     The University pays variable interest monthly based on the 30 Day LIBOR rates until that index reaches 1.5%. If 30 Day LIBOR is equal to 1.5% through 3.0%, the University pays 1.5%. If 30 Day LIBOR exceeds 3.0%, the University pays actual 30 Day LIBOR less 1.5%.          
Interest expense on derivatives related to credit risk     $ 3,000          
Interest Rate Corridor [Member] | LIBOR [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Maximum percentage of variable interest rates based on LIBOR     1.50%          
Percentage of amount paid by University     1.50%          
Minimum percentage of LIBOR 1.50%   1.50%          
Maximum percentage of LIBOR 3.00%   3.00%          
Percentage deducted from LIBOR for actual payment     1.50%          
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          
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