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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 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
Interest rate on notes     11.00%    
Interest rate on loan     6.00%    
Default rate     5.00%    
Interest income and other income on the loan   1,459 2,187    
Default interest amount 432   432    
Late payment penalty amount 1,392   1,392    
Statutory trustee's fee amount 139   139    
Additional amount deposited in escrow 344   344    
Default interest and statutory trustee's fee     11.00%    
Date of order for late penalty funds     Oct. 28, 2013    
Period of LIBOR interest rate     30 days    
Effective portion of gain/loss on derivatives included as a component of other comprehensive income, net of taxes 61 (75) (113) 448  
Reduction in revenue due to scholarships offered to students     96,188 75,668  
Period for write off of inactive student accounts     150 days    
Other Assets [Member]
          
Summary Of Significant Accounting Policies [Line Items]          
Fair value of interest rate corridor instrument 1,625   1,625    
Interest Rate Corridor [Member]
          
Summary Of Significant Accounting Policies [Line Items]          
Notional amount of derivative instrument 88,333   88,333    
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     7    
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, net of taxes     $ 113 $ 448  
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