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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Receivables [Abstract]    
Balance, Beginning of Period $ 31,964 $ 24,836
Beginning balance related to business acquisition 2,174  
Provision for credit losses 12,862 11,722
Amounts Written-off (11,601) (9,499)
Recoveries 696 870
Balance, End of Period $ 36,095 $ 27,929