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Student Receivables - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Student receivables write-off period, days past due   Greater than 90 days  
Delayed receipt amount $ 24.3    
Student receivables, net of allowance for doubtful accounts and net of deferred tuition revenue   4.3 6.1
Outstanding net recourse loan receivable   $ 2.5 $ 3.2