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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Receivables [Abstract]        
Balance, Beginning of Period $ 25,522 $ 32,898 $ 27,646 $ 38,206
Charges to Expense 6,474 [1] 6,811 [1] 12,263 [1] 12,383 [1]
Amounts Written-off (7,226) (7,409) (15,139) (18,289)
Balance, End of Period $ 24,770 $ 32,300 $ 24,770 $ 32,300
[1] Charges to expense include an offset for recoveries of amounts previously written off of $2.2 million and $2.1 million for the quarters ended June 30, 2014 and 2013, respectively, and $4.5 million and $4.2 million for the years to date ended June 30, 2014 and 2013, respectively.