Revenue Recognition - Summary of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue		$ 693,034		$ 687,314		$ 627,704
Tuition, Net [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		653,952	[1]	651,801		595,682
Technology Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		32,571		30,809		27,256
Other Miscellaneous Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[2]	1,892		1,969		2,118
Tuition and Fees, Net [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		688,415		684,579		625,056
Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3]	4,619		2,735		2,648
University Group [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		408,549	[4],[5]	405,507		392,263	[6]
University Group [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		283,360	[7],[8]	281,361	[8]	235,374	[9]
University Group [Member] | Tuition, Net [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		384,307	[1],[4]	381,371		370,318
University Group [Member] | Tuition, Net [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		269,645	[1],[7]	270,430		225,364
University Group [Member] | Technology Fees [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		21,249	[4]	20,687		17,844
University Group [Member] | Technology Fees [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		11,322	[7]	10,122		9,412
University Group [Member] | Other Miscellaneous Fees [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[2]	1,227	[4]	1,283		1,690
University Group [Member] | Other Miscellaneous Fees [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[2]	665	[7]	686		428
University Group [Member] | Tuition and Fees, Net [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		406,783	[4]	403,341		389,852
University Group [Member] | Tuition and Fees, Net [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		281,632	[7]	281,238		235,204
University Group [Member] | Other [Member] | CTU [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3]	1,766	[4]	2,166		2,411
University Group [Member] | Other [Member] | AIUS [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3]	1,728	[7]	123		170
Corporate and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[11]	1,125	[10]	446		67	[10],[12]
Corporate and Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	[3],[11]	$ 1,125		$ 446		$ 67

[1] Tuition includes revenue earned for degree-granting programs as well as revenue earned for non-degree professional development and continuing education offerings related to the DigitalCrafts and Hippo acquisitions from the date of acquisitions.

[2] Other miscellaneous fees include student activity fees and graduation fees.

[3] Other revenue primarily includes contract training revenue and miscellaneous non-student related revenue.

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

[5] 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.

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

[7] 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.

[8] 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.

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

[10] 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.

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

[12] 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.