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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, 2014
Mar. 31, 2013
Receivables [Abstract]    
Balance, Beginning of Period $ 27,953 $ 39,163
Charges to Expense 5,866 [1] 5,751 [1]
Amounts Written-off (8,056) (11,179)
Balance, End of Period $ 25,763 $ 33,735
[1] Charges to expense include an offset for recoveries of amounts previously written off of $2.3 million and $2.1 million for the quarters ended March 31, 2014 and 2013, respectively.