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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 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 $ 85   $ 225
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    
Default interest held under escrow 2,068    
Reduction in revenue due to scholarships offered to students 49,559 44,099  
Percent of financial aid earn by student 100.00%    
Period for write off of inactive student accounts 150 days    
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 2,005    
Inception date of derivative agreements Mar. 01, 2013    
Maturity date of derivative agreements Dec. 20, 2019    
Notional amount of interest rate swap 87,324    
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%    
Interest expense on derivatives related to credit risk 10    
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 9,343    
Fixed interest rate payable on the amortizing notional amount 3.245%    
Pledged collateral as restricted cash 85   225
Interest expense on derivatives related to credit risk 10    
Interest Rate Swap [Member] | Accrued Liabilities [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Fair value of interest rate swap liability 247    
Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Fair value of interest rate swap liability     $ 390