Revenue Recognition - Summary of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue		$ 695,208		$ 693,034		$ 687,314
Tuition, Net [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		654,760	[1]	653,952	[1]	651,801
Technology Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		31,073		32,571		30,809
Other Miscellaneous Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[2]	1,839		1,892		1,969
Tuition and Fees, Net [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		687,672		688,415		684,579
Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3]	7,536		4,619		2,735
University Group [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[4]	419,617	[5]	408,549	[5]	405,507
University Group [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[6]	274,479	[7]	283,360	[7]	281,361
University Group [Member] | Tuition, Net [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[4]	396,093	[1]	384,307	[1]	381,371
University Group [Member] | Tuition, Net [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[6]	258,667	[1]	269,645	[1]	270,430
University Group [Member] | Technology Fees [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[4]	19,454		21,249		20,687
University Group [Member] | Technology Fees [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[6]	11,619		11,322		10,122
University Group [Member] | Other Miscellaneous Fees [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[2],[4]	816		1,227		1,283
University Group [Member] | Other Miscellaneous Fees [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[2],[6]	1,023		665		686
University Group [Member] | Tuition and Fees, Net [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[4]	416,363		406,783		403,341
University Group [Member] | Tuition and Fees, Net [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[6]	271,309		281,632		281,238
University Group [Member] | Other [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3],[4]	3,254		1,766		2,166
University Group [Member] | Other [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3],[6]	3,170		1,728		123
Corporate and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[8]	1,112		1,125		446
Corporate and Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3],[8]	$ 1,112		$ 1,125		$ 446

[1] Tuition includes revenue earned for all degree-granting programs as well as revenue earned for non-degree and professional development programs.

[2] Other miscellaneous fees primarily include graduation fees.

[3] Other revenue primarily includes contract training revenue and 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.

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