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Notes Payable and Other Noncurrent Liabilities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Line Of Credit Facility Covenant Compliance [Line Items]    
Increase in the term loan $ 100,000  
Maturity date of the University's existing loan, before amendment December 31, 2019  
Decreased the interest rate on the outstanding balance from the BBA Libor Rate plus 200 basis points to the BBA Libor Rate plus 175 basis points  
Interest rate on the outstanding balance, before amendment, basis points 2.00%  
Interest rate on the outstanding balance, after amendment, basis points 1.75%  
Amount of revolving line of credit 50,000  
Revolving line of credit facility, expiration date Dec. 31, 2017  
Amount available to be borrowed on the line of credit 50,000  
Long-term deferred rent 7,015 6,512
Derivative liability for forward interest rate swap $ 390 $ 628