Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue		$ 693,034		$ 687,314		$ 627,704
Operating Income (Loss)		149,016		142,934		86,462
Depreciation and amortization		16,766		14,786		9,145
Capital Expenditures		10,453		9,768		5,174
Total Assets	[1]	847,433		721,517
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	[3]	1,125	[2]	446		67	[2],[4]
Operating Income (Loss)		(38,595)	[2]	(26,378)		(38,553)	[2],[4]
Depreciation and amortization		333	[2]	320		360	[2],[4]
Capital Expenditures		5,838	[2]	8,434		4,183	[2],[4]
Total Assets	[1]	542,954	[2]	482,993
CTU [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue		408,549	[5],[6]	405,507		392,263	[7]
Operating Income (Loss)		148,481	[6]	138,490		108,602	[7]
Depreciation and amortization		7,365	[6]	6,165		5,397	[7]
Capital Expenditures		2,949	[6]	110		580	[7]
Total Assets	[1]	153,072	[6]	96,922
AIUS [Member] | University Group [Member]
Segment Reporting Information [Line Items]
Revenue		283,360	[8],[9]	281,361	[9]	235,374	[10]
Operating Income (Loss)		39,130	[9]	30,822	[9]	16,413	[10]
Depreciation and amortization		9,068	[9]	8,301	[9]	3,388	[10]
Capital Expenditures		1,666	[9]	1,224	[9]	$ 411	[10]
Total Assets	[1],[9]	$ 151,407		$ 141,602

[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] Corporate and Other includes results of operations and total assets for closed campuses. 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] Corporate and Other results of operations include a $7.1 million charge related to the Oregon arbitration matter for closed campuses for the year ended December 31, 2019.

[5] CTU includes revenue related to the Hippo acquisition commencing on the September 10, 2021 date of acquisition.

[6] CTU results of operations and total assets include the Hippo acquisition commencing on the September 10, 2021 date of acquisition and as of December 31, 2021.

[7] CTU results of operations include a $18.6 million charge related to the FTC settlement for the year ended December 31, 2019.

[8] AIUS includes revenue related to the (i) DigitalCrafts acquisition commencing on the August 2, 2021 date of acquisition, and (ii) Trident acquisition commencing on the March 2, 2020 date of acquisition.

[9] AIUS results of operations and total assets include the DigitalCrafts acquisition commencing on the August 2, 2021 date of acquisition and as of December 31, 2021 and the Trident acquisition commencing on the March 2, 2020 date of acquisition and as of December 31, 2021 and 2020.

[10] AIUS results of operations include a $11.4 million charge related to the FTC settlement for the year ended December 31, 2019.