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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Sep. 30, 2013
Mar. 31, 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 2,187 1,459    
Default interest amount 432      
Late payment penalty amount 1,392      
Statutory trustee's fee amount 139      
Additional amount deposited in escrow 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      
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%      
Maximum percentage of LIBOR 3.00%      
Percentage deducted from LIBOR for actual payment 1.50%      
Interest expense on derivatives related to credit risk 3      
Reduction in revenue due to scholarships offered to students 37,719   28,255  
Percent of financial aid earn by student 100.00%      
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 1,802      
Interest Rate Swap [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Interest rate swap inception date May 01, 2010      
Interest rate swap maturity date Apr. 30, 2014      
Notional amount of interest rate swap 8,701      
Percentage of fixed interest on the amortizing notional amount of interest rate swap 3.245%      
Interest Rate Swap [Member] | Accrued Liabilities [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Fair value of the interest rate swap liability 44      
Interest Rate Corridor [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Notional amount of interest rate swap 82,966      
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%.      
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 $ (43)   $ 71  
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