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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Receivables [Abstract]    
Balance, Beginning of Period $ 20,229 $ 19,097
Charges to Expense [1] 9,607 4,269
Amounts Written-off (7,068) (5,117)
Balance, End of Period $ 22,768 $ 18,249
[1] Charges to expense include an offset for recoveries of amounts previously written off of $2.0 million for each of the quarters ended March 31, 2016 and 2015.