Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		$ 67,850	$ 58,022	$ 113,719	$ 85,402
Revenue earned from prior balances		(57,208)	(49,791)	(93,499)	(70,507)
Billings during period	[1]	165,024	239,765	300,220	394,110
Revenue earned for new billings during the period		(108,688)	(125,013)	(253,724)	(287,128)
Other adjustments		507	(1,516)	769	(410)
Gross deferred revenue, ending balance		67,485	121,467	67,485	121,467
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		39,343	25,136	64,674	28,522
Revenue earned from prior balances		(33,358)	(22,814)	(55,433)	(25,698)
Billings during period	[1]	88,990	155,861	175,611	257,645
Revenue earned for new billings during the period		(66,391)	(78,828)	(156,867)	(181,324)
Other adjustments		273	(1,537)	872	(1,327)
Gross deferred revenue, ending balance		28,857	77,818	28,857	77,818
University Group [Member] | AIUS [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		28,507	32,886	49,045	56,880
Revenue earned from prior balances		(23,850)	(26,977)	(38,066)	(44,809)
Billings during period	[1]	76,034	83,904	124,609	136,465
Revenue earned for new billings during the period		(42,297)	(46,185)	(96,857)	(105,804)
Other adjustments		234	21	(103)	917
Gross deferred revenue, ending balance		$ 38,628	$ 43,649	$ 38,628	$ 43,649

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