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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Receivables [Abstract]        
Balance, Beginning of Period $ 30,730 $ 24,268 $ 24,836 $ 22,534
Charges to Expense [1] 8,888 7,932 32,042 21,675
Amounts Written-off (10,621) (8,649) (27,881) (20,658)
Balance, End of Period $ 28,997 $ 23,551 $ 28,997 $ 23,551
[1] Charges to expense include an offset for recoveries of amounts previously written off of $0.6 million and $1.8 million for the quarters ended September 30, 2019 and 2018, respectively, and $2.0 million and $4.3 million for the years to date ended September 30, 2019 and 2018, respectively.