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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
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 344,000   $ 344,000        
Date of order for late penalty funds     Oct. 28, 2013        
Period of LIBOR interest rate     30 days        
Effective portion of loss on derivative included as a component of other comprehensive income, net of taxes (64,000) $ 148,000 $ 175,000 $ 174,000      
Description of area of the company's campus in Phoenix, Arizona     200+ acre campus        
Reduction in revenue due to scholarships offered to students     $ 76,947,000 $ 63,632,000      
Period for write off of inactive student accounts     150 days        
Interest Rate Corridor [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Notional amount of derivative instrument $ 83,333,000   $ 83,333,000        
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%.        
Maximum percentage of variable interest rates based on LIBOR     1.50%        
Debt instrument, description of variable rate basis     LIBOR        
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%        
Interest expense on derivatives related to credit risk     $ 4,000        
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     288,000        
Other Assets [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Fair values of interest rate corridor instrument $ 1,040,000   $ 1,040,000     $ 1,332,000  
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