XML 37 R26.htm IDEA: XBRL DOCUMENT v3.7.0.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jan. 01, 2017
Dec. 31, 2016
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 $ (17,000) $ 97,000 $ 376,000 $ 136,000    
Description of area of the company's campus in Phoenix, Arizona     270 acre campus      
Reduction in revenue due to scholarships offered to students     $ 91,703,000 85,308,000    
Period for write off of inactive student accounts     150 days      
Excess tax benefits from financing activities       5,484,000    
Reduction in provision for income taxes 13,752,000   $ 13,752,000      
Interest Rate Corridor [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Notional amount of derivative instrument 70,000,000   $ 70,000,000      
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 loss on derivatives included as a component of other comprehensive income, net of taxes     $ 119,000 $ 526,000    
Retained Earnings [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Cumulative effect from the adoption of accounting pronouncements, net of taxes (59,000)   (59,000)   $ (59,000)  
Additional Paid-in Capital [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Cumulative effect from the adoption of accounting pronouncements, net of taxes 59,000   59,000   $ 59,000  
Other Assets [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Fair values of interest rate corridor instrument $ 372,000   $ 372,000     $ 490,000
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%