Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance	$ 104,703	$ 67,485		$ 107,200	$ 113,719
Business acquisitions, beginning balance		2,419			2,419
Revenue earned from prior balances	(84,783)	(55,140)		(92,624)	(95,493)
Billings during period	154,491	195,834	[1]	530,071	496,054	[1]
Revenue earned for new billings during the period	(93,476)	(111,297)		(463,474)	(418,167)
Other adjustments	(2,195)	(593)		(2,433)	176
Gross deferred revenue, ending balance	78,740	98,708		78,740	98,708
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance	72,702	28,857		67,245	64,674
Revenue earned from prior balances	(59,047)	(23,765)		(59,458)	(56,274)
Billings during period	95,064	142,580	[1]	343,194	318,191	[1]
Revenue earned for new billings during the period	(60,326)	(72,826)		(301,620)	(252,617)
Other adjustments	(1,283)	(1,003)		(2,251)	(131)
Gross deferred revenue, ending balance	47,110	73,843		47,110	73,843
University Group [Member] | AIUS [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance	32,001	38,628		39,955	49,045
Business acquisitions, beginning balance		2,419			2,419
Revenue earned from prior balances	(25,736)	(31,375)		(33,166)	(39,219)
Billings during period	59,427	53,254	[1]	186,877	177,863	[1]
Revenue earned for new billings during the period	(33,150)	(38,471)		(161,854)	(165,550)
Other adjustments	(912)	410		(182)	307
Gross deferred revenue, ending balance	$ 31,630	$ 24,865		$ 31,630	$ 24,865

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