Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenue		$ 695,208		$ 693,034		$ 687,314
Operating Income (Loss)		129,637		149,016		142,934
Depreciation and amortization		19,734		16,766		14,786
Capital Expenditures		12,620		10,453		9,768
Total Assets	[1]	957,368		847,433
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	1,112		1,125		446
Operating Income (Loss)	[3]	(45,300)		(38,595)		(26,378)
Depreciation and amortization	[3]	340		333		320
Capital Expenditures	[3]	7,910		5,838		8,434
Total Assets	[1],[3]	523,915		542,954
CTU [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue	[4]	419,617	[5]	408,549	[5]	405,507
Operating Income (Loss)		141,622	[5]	148,481	[5]	138,490
Depreciation and amortization		10,069	[5]	7,365	[5]	6,165
Capital Expenditures		3,641	[5]	2,949	[5]	110
Total Assets	[1],[5]	247,510		153,072
AIUS [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue	[6]	274,479	[7]	283,360	[7]	281,361
Operating Income (Loss)		33,315	[7]	39,130	[7]	30,822
Depreciation and amortization		9,325	[7]	9,068	[7]	8,301
Capital Expenditures		1,069	[7]	1,666	[7]	$ 1,224
Total Assets	[1],[7]	$ 185,943		$ 151,407

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

[2] Revenue recorded within Corporate and Other relates to miscellaneous non-student related revenue.

[3] Revenue recorded within Corporate and Other relates to miscellaneous non-student related revenue.

[4] CTU includes revenue related to an acquisition completed on December 1, 2022 and an acquisition completed on September 10, 2021.

[5] CTU results of operations include the Coding Dojo acquisition commencing on the December 1, 2022 date of acquisition and the Hippo acquisition commencing on the September 10, 2021 date of acquisition.

[6] AIUS includes revenue related to an acquisition completed on July 1, 2022, an acquisition completed on August 2, 2021 and an acquisition completed on March 2, 2020.

[7] AIUS results of operations include the CalSouthern acquisition commencing on the July 1, 2022 date of acquisition and the DigitalCrafts acquisition commencing on the August 2, 2021 date of acquisition.