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Student Receivables - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Student receivables write-off period, days past due Greater than 90 days  
Student receivables, net of allowance for doubtful accounts and net of deferred tuition revenue $ 4.2 $ 5.2