Revenue Recognition - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Portfolio	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Portfolio	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Revenue Recognition [Line Items]
Length of academic year			210 days
Revenue recognized estimated reserve based on historical evidence	$ 1.1		$ 1.1		$ 0.9
ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Revenue recognized for payments received from withdrawn students	$ 0.4	$ 0.4	$ 0.9	$ 1.1
Number of portfolio for revenue recognition | Portfolio	1		1
Minimum [Member]
Revenue Recognition [Line Items]
Length of academic terms			70 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			77 days
Maximum [Member] | ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Days required for documentation to be eligible and approved for funding			120 days