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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]      
Recoveries of amounts previously written off $ 2.6 $ 5.7 $ 4.2