Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue		$ 179,923		$ 168,420	$ 562,085		$ 519,063
Percentage of total revenue		100.00%		100.00%	100.00%		100.00%
Operating Income (Loss)		$ 43,073		$ 29,324	$ 134,503		$ 106,963
Total Assets	[1]	1,026,034			1,026,034			$ 957,368
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue		$ 145		$ 276	$ 621		$ 858
Percentage of total revenue		0.10%		0.20%	0.10%		0.20%
Operating Income (Loss)		$ (7,020)		$ (11,772)	$ (28,812)		$ (30,423)
Total Assets	[1]	572,631			572,631			523,915
CTU [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	$ 120,552	[3]	$ 97,562	$ 364,336	[3]	$ 311,171
Percentage of total revenue	[2]	67.00%		57.90%	64.80%		59.90%
Operating Income (Loss)	[2]	$ 34,491		$ 31,506	$ 118,632		$ 107,540
Total Assets	[1]	260,285			260,285			247,510
AIUS [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue	[4],[5]	$ 59,226		$ 70,582	$ 197,128		$ 207,034
Percentage of total revenue	[4]	32.90%		41.90%	35.10%		39.90%
Operating Income (Loss)	[4]	$ 15,602		$ 9,590	$ 44,683		$ 29,846
Total Assets	[1]	$ 193,118			$ 193,118			$ 185,943

[1] Total assets are presented on a condensed consolidated basis and do not include intercompany receivable or payable activity between institutions and corporate and investments in subsidiaries.

[2] CTU results of operations include the Coding Dojo acquisition commencing on the December 1, 2022 date of acquisition. Additionally, impairment of $7.4 million was recorded during the quarter ended September 30, 2023 related to certain definite-lived intangible assets.

[3] CTU includes revenue related to an acquisition completed on December 1, 2022.

[4] AIUS results of operations include the CalSouthern acquisition commencing on the July 1, 2022 date of acquisition.

[5] AIUS includes revenue related to an acquisition completed on July 1, 2022.