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Student Receivables - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Approximate length of current academic year 210 days  
Student receivables, net of allowance for doubtful accounts $ 1.3 $ 1.4
Minimum [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Student receivables write-off period, days past due 90 days