Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		$ 107,200	$ 113,719
Revenue earned from prior balances		(84,465)	(90,939)
Billings during period	[1]	153,144	135,196
Revenue earned for new billings during the period		(108,854)	(90,388)
Other adjustments		(1,193)	262
Gross deferred revenue, ending balance		65,832	67,850
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		67,245	64,674
Revenue earned from prior balances		(54,712)	(53,952)
Billings during period	[1]	100,012	86,621
Revenue earned for new billings during the period		(68,709)	(58,599)
Other adjustments		(1,464)	599
Gross deferred revenue, ending balance		42,372	39,343
University Group [Member] | AIUS [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		39,955	49,045
Revenue earned from prior balances		(29,753)	(36,987)
Billings during period	[1]	53,132	48,575
Revenue earned for new billings during the period		(40,145)	(31,789)
Other adjustments		271	(337)
Gross deferred revenue, ending balance		$ 23,460	$ 28,507

[1] Billings during period includes adjustments for prior billings.