Revenue Recognition - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Portfolio	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Revenue Recognition [Line Items]
Length of academic year	210 days
Revenue recognized estimated reserve based on historical evidence	$ 2.3	$ 1.1
ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Revenue recognized for payments received from withdrawn students	$ 1.1	$ 1.2	$ 1.4
Number of portfolio for revenue recognition | Portfolio	1
Minimum [Member]
Revenue Recognition [Line Items]
Length of academic terms	56 days
Minimum [Member] | ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Days required for documentation to be eligible and approved for funding	90 days
Maximum [Member]
Revenue Recognition [Line Items]
Length of academic terms	84 days
Maximum [Member] | ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Days required for documentation to be eligible and approved for funding	120 days