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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Receivables [Abstract]        
Balance, Beginning of Period $ 14,359 $ 16,582 $ 14,517 $ 17,570
Charges to Expense [1] 5,527 5,852 13,945 16,572
Amounts Written-off (4,975) (6,449) (13,551) (18,157)
Balance, End of Period $ 14,911 $ 15,985 $ 14,911 $ 15,985
[1] Charges to expense include an offset for recoveries of amounts previously written off of $1.0 million and $1.4 million for the quarters ended September 30, 2015 and 2014, respectively, and $3.3 million and $4.5 million for the years to date ended September 30, 2015 and 2014, respectively.