Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023		Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue		$ 195,598		$ 182,959
Percentage of total revenue		100.00%		100.00%
Operating Income (Loss)		$ 43,336		$ 43,693
Total Assets	[1]	963,012			$ 957,368
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue		$ 266		$ 279
Percentage of total revenue		0.10%		0.20%
Operating Income (Loss)		$ (12,357)		$ (8,856)
Total Assets	[1]	516,466			523,915
CTU [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	$ 124,492	[3]	$ 113,148
Percentage of total revenue	[2]	63.70%		61.80%
Operating Income (Loss)	[2]	$ 43,690		$ 43,026
Total Assets	[1]	254,454			247,510
AIUS [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue	[4],[5]	$ 70,840		$ 69,532
Percentage of total revenue	[4]	36.20%		38.00%
Operating Income (Loss)	[4]	$ 12,003		$ 9,523
Total Assets	[1]	$ 192,092			$ 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.

[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.