Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 55
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=116646759&loc=d3e15243-108350

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Name:	us-gaap_LitigationReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Segment Reporting - Summary Financial Information by Reporting Segment (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CTU [Member]
Segment Reporting Information [Line Items]
Settlement reserve			$ 18.6
AIUS [Member]
Segment Reporting Information [Line Items]
Settlement reserve			11.4
CTU [Member] \| Hippo
Segment Reporting Information [Line Items]
Acquisition date	Sep. 10, 2021
AIUS [Member] \| DigitalCrafts
Segment Reporting Information [Line Items]
Acquisition date	Aug. 02, 2021
AIUS [Member] \| Trident University International
Segment Reporting Information [Line Items]
Acquisition date	Mar. 02, 2020	Mar. 02, 2020
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Significant legal settlements charge			$ 7.1