Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue Recognition [Line Items]
Length of academic year			210 days
Revenue recognized estimated reserve based on historical evidence	$ 2.4		$ 2.4		$ 2.1
ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Revenue recognized for payments received from withdrawn students	$ 0.3	$ 0.5	$ 0.7	$ 0.9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
Online Courses [Member] | Minimum [Member]
Revenue Recognition [Line Items]
Length of Non-Degree Professional Programs			84 days
Online Courses [Member] | Maximum [Member]
Revenue Recognition [Line Items]
Length of Non-Degree Professional Programs			126 days
Subscription Based Access [Member] | Maximum [Member]
Revenue Recognition [Line Items]
Length of Non-Degree Professional Programs			364 days