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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Receivables [Abstract]        
Balance, Beginning of Period $ 24,574 $ 21,008 $ 23,142 $ 20,229
Charges to Expense [1] 6,420 8,457 21,630 23,332
Amounts Written-off (6,332) (8,407) (20,110) (22,503)
Balance, End of Period $ 24,662 $ 21,058 $ 24,662 $ 21,058
[1] Charges to expense include an offset for recoveries of amounts previously written off of $0.8 million and $1.3 million for the quarters ended September 30, 2017 and 2016, respectively, and $3.5 million and $4.9 million for the years to date ended September 30, 2017 and 2016, respectively.