Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Share-Based Compensation
Share-based compensation expense included in operating expenses	$ 10,855	$ 9,958
Tax effect of share-based compensation	(2,714)	(2,489)
Share-based compensation expense, net of tax	8,141	7,469
Technology and academic services
Share-Based Compensation
Share-based compensation expense included in operating expenses	1,925	1,814
Counseling services and support
Share-Based Compensation
Share-based compensation expense included in operating expenses	5,402	5,155
Marketing and communication
Share-Based Compensation
Share-based compensation expense included in operating expenses	168	143
General and administrative
Share-Based Compensation
Share-based compensation expense included in operating expenses	$ 3,360	$ 2,846

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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