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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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    
Reduced pledge collateral $ 225,000   $ 225,000
Note receivable from a financial institution at fair market value     27,000,000
Interest rate on notes 11.00%    
Interest rate on loan 6.00%    
Default rate 5.00%    
Interest income and other income on the loan 2,187,000    
Default interest held under escrow 2,068,000    
Reduction in revenue due to scholarships offered to students 28,255,000 23,865,000  
Percent of financial aid earn by student 100.00%    
Period for write off of inactive student accounts 150 days    
Interest rate swap [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Interest rate receivable on interest rate swap amortizing notional amount 30 Day LIBOR    
Inception date of derivative agreements May 01, 2010    
Maturity date of derivative agreements Apr. 30, 2014    
Notional amount of interest rate swap 9,557    
Fixed interest rate payable on the amortizing notional amount 3.245%    
Pledged collateral as restricted cash 225   225
Interest expense on derivatives related to credit risk 30    
Interest rate corridor [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Interest rate receivable on interest rate swap amortizing notional amount 30 Day LIBOR    
Fair value of interest rate corridor instruments 1,241    
Fair value of interest rate swap liability, included in other noncurrent liability 319   390
Inception date of derivative agreements Mar. 01, 2013    
Maturity date of derivative agreements Dec. 20, 2019    
Notional amount of interest rate swap $ 88,777    
Interest rate payable on interest rate corridor if 30 day LIBOR is less than 1.5% 30 Day LIBOR    
Interest rate payable on interest rate corridor 30 day LIBOR equal to 1.5% through 3% 1.50%    
Interest rate payable on interest rate corridor 30 day LIBOR exceeds 3.0% 30 Day LIBOR less 1.5%