Student Receivables - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Approximate length of current academic year	30 weeks
Student receivables, net of allowance for doubtful accounts	$ 1.2	$ 1.2
Minimum [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Student receivables write-off period, days past due	90 days