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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Receivables [Abstract]    
Balance, Beginning of Period $ 47,158 $ 63,541
Charges to Expense 6,673 8,970
Amounts Written-off (12,025) (13,880)
Balance, End of Period $ 41,806 $ 58,631