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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
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    
Description of area of the company's campus in Phoenix, Arizona 275 acre campus    
Reduction in revenue due to scholarships offered to students $ 60,241,000 $ 54,653,000  
Period for write off of inactive student accounts 150 days    
Cumulative effect from the adoption of accounting pronouncements, net of taxes $ 1,174,000    
Deferred revenue 64,130,000   $ 46,895,000
Interest Rate Corridor [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Notional amount of derivative instrument $ 65,000,000    
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 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 gain (loss) on derivatives included as a component of other comprehensive income $ 231,000 $ (8,000)  
Other Assets [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Fair values of interest rate corridor instrument $ 739,000   $ 509,000
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%    
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%    
Revenue from Contracts with Customers [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Direct and incremental capitalized costs $ 9,015,000    
Deferred revenue $ 7,451,000