Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue Recognition [Line Items]
Length of academic year	210 days
Revenue recognized estimated reserve based on historical evidence	$ 1.1		$ 1.1
ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Revenue recognized for payments received from withdrawn students	$ 0.3	$ 0.2
Minimum [Member]
Revenue Recognition [Line Items]
Length of academic terms	56 days
Maximum [Member]
Revenue Recognition [Line Items]
Length of academic terms	84 days