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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Receivables [Abstract]        
Balance, Beginning of Period $ 24,728 $ 32,188 $ 27,576 $ 38,013
Charges to Expense 6,779 [1] 7,416 [1] 19,023 [1] 19,755 [1]
Amounts Written-off (7,777) (9,204) (22,869) (27,368)
Balance, End of Period $ 23,730 $ 30,400 $ 23,730 $ 30,400
[1] Charges to expense include an offset for recoveries of amounts previously written off of $2.2 million and $1.5 million for the quarters ended September 30, 2014 and 2013, respectively, and $6.7 million and $5.6 million for the years to date ended September 30, 2014 and 2013, respectively.