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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 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   $ 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 1,459   2,187    
Default interest amount 432   432    
Late payment penalty amount 1,392   1,392    
Statutory trustee's fee amount 139   139    
Default interest and statutory trustee's fee 11.00%        
Unrealized (losses) gains on hedging derivatives, net of taxes (75) 33 448 95  
Reduction in revenue due to scholarships offered to students     75,668 65,563  
Percent of financial aid earn by student     100.00%    
Period for write off of inactive student accounts     150 days    
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    
Interest Rate Swap [Member]
          
Summary Of Significant Accounting Policies [Line Items]          
Interest rate receivable on interest rate swap amortizing notional amount 30 Day LIBOR   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 9,129   9,129    
Fixed interest rate payable on the amortizing notional amount 3.245%   3.245%    
Pledged collateral as restricted cash 85   85   225
Interest expense on derivatives related to credit risk     8    
Interest Rate Swap [Member] | Accrued Liabilities [Member]
          
Summary Of Significant Accounting Policies [Line Items]          
Fair value of interest rate swap liability 178   178    
Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member]
          
Summary Of Significant Accounting Policies [Line Items]          
Fair value of interest rate swap liability         390
Interest Rate Corridor [Member]
          
Summary Of Significant Accounting Policies [Line Items]          
Interest rate receivable on interest rate swap amortizing notional amount 30 Day LIBOR   30 Day LIBOR    
Fair value of interest rate corridor instruments 1,808   1,808    
Inception date of derivative agreements     Mar. 01, 2013    
Maturity date of derivative agreements     Dec. 20, 2019    
Notional amount of interest rate swap 85,871   85,871    
Interest rate payable on interest rate corridor if 30 day LIBOR is less than 1.5% 30 Day LIBOR   30 Day LIBOR    
Interest rate payable on interest rate corridor 30 day LIBOR equal to 1.5% through 3% 1.50%   1.50%    
Interest rate payable on interest rate corridor 30 day LIBOR exceeds 3.0% 30 Day LIBOR less 1.5%   30 Day LIBOR less 1.5%    
Interest expense on derivatives related to credit risk     $ 8