Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		$ 113,719	$ 85,402
Revenue earned from prior balances		(90,939)	(68,092)
Billings during period	[1]	135,196	154,345
Revenue earned for new billings during the period		(90,388)	(114,739)
Other adjustments		262	1,106
Gross deferred revenue, ending balance		67,850	58,022
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		64,674	28,522
Revenue earned from prior balances		(53,952)	(25,689)
Billings during period	[1]	86,621	101,784
Revenue earned for new billings during the period		(58,599)	(79,691)
Other adjustments		599	210
Gross deferred revenue, ending balance		39,343	25,136
University Group [Member] | AIUS [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		49,045	56,880
Revenue earned from prior balances		(36,987)	(42,403)
Billings during period	[1]	48,575	52,561
Revenue earned for new billings during the period		(31,789)	(35,048)
Other adjustments		(337)	896
Gross deferred revenue, ending balance		$ 28,507	$ 32,886

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