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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]      
Balance, Beginning of Period $ 23,142 $ 20,229 $ 19,097
Charges to Expense [1] 27,571 32,049 22,212
Amounts Written-off (28,179) (29,136) (21,080)
Balance, End of Period $ 22,534 $ 23,142 $ 20,229
[1] Charges to expense include an offset for recoveries of amounts previously written off of $4.2 million, $6.2 million and $6.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.