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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
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    
Period of LIBOR interest rate     30 days    
Effective portion of loss on derivatives included as a component of other comprehensive income, net of taxes $ (87,000) $ 64,000 $ (325,000) $ (175,000)  
Description of area of the company's campus in Phoenix, Arizona     250-acre campus    
Reduction in revenue due to scholarships offered to students     $ 85,308,000 76,947,000  
Period for write off of inactive student accounts     150 days    
Noncurrent deferred tax liabilities 17,522,000   $ 17,522,000   $ 14,855,000
Adjustments for New Accounting Pronouncement [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Current deferred tax assets decreased         6,448,000
Noncurrent deferred tax liabilities         14,855,000
As Reported [Member] | Adjustments for New Accounting Pronouncement [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Noncurrent deferred tax liabilities         21,303,000
Interest Rate Corridor [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Notional amount of derivative instrument 76,667,000   $ 76,667,000    
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%.    
Reduction in interest expense on derivatives related to credit risk     $ 7,000    
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%    
Percentage deducted from LIBOR for actual payment     1.50%    
Cash Flow Hedging [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Effective portion of loss on derivatives included as a component of other comprehensive income, net of taxes     $ 526,000 $ 288,000  
Other Assets [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Fair values of interest rate corridor instrument $ 210,000   $ 210,000   $ 728,000
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    
Minimum [Member] | Interest Rate Corridor [Member] | LIBOR [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Percentage of LIBOR 1.50%   1.50%    
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] | Interest Rate Corridor [Member] | LIBOR [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Percentage of LIBOR 3.00%   3.00%