Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue Recognition [Line Items]
Length of academic year			210 days
Revenue recognized estimated reserve based on historical evidence	$ 1.2		$ 1.2		$ 1.1
ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Revenue recognized for payments received from withdrawn students	$ 0.2	$ 0.4	$ 0.8	$ 0.9
Minimum [Member]
Revenue Recognition [Line Items]
Length of academic terms			56 days
Maximum [Member]
Revenue Recognition [Line Items]
Length of academic terms			84 days