Dispositions (Details) $ in Thousands					1 Months Ended			3 Months Ended			12 Months Ended
	Aug. 23, 2022 USD ($)	Sep. 10, 2021 USD ($)	Aug. 12, 2021 USD ($)	May 28, 2021 USD ($)	Jan. 31, 2024 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2021 HKD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 14, 2022 USD ($)	Sep. 15, 2021 USD ($)	Mar. 08, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount receivable, noncurrent														$ 71,700,000
Contingent consideration recognized										$ 6,500,000
Restricted cash										$ 20,774,000	$ 7,505,000	$ 8,617,000	$ 20,774,000
LEI Lie Ying Limited | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business												$ 13,600,000
Net proceeds from divestiture						$ 21,650,000	$ 168,284
Fundacion Nasser | Discontinued Operations, Disposed of by Sale | Chile
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from collection of notes receivable		$ 21,500,000
Fundacion Nasser | Discontinued Operations, Disposed of by Sale | Honduras
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received from dispositions																$ 24,000,000
Gain (loss) on disposition of business											$ (1,700,000)
Additional consideration paid held in escrow																$ 2,000,000
Percentage of escrow funds released after 18 months																50.00%
Percentage of escrow funds released after 24 months																25.00%
Amount of escrow funds released after 36 months																$ 750,000
Partial release of consideration paid held in escrow								$ 250,000	$ 1,000,000
Anima | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business													$ 33,000,000
Net proceeds from divestiture				$ 625,000,000
Indebtedness assumed by buyer				$ 121,000,000
Walden e-Learning, LLC | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from collection of notes receivable	$ 71,700,000
Gain (loss) on disposition of business			$ 619,400,000
Net proceeds from dispositions			1,403,500,000
Estimated tax expense			$ 278,000,000
Walden e-Learning, LLC | Discontinued Operations, Disposed of by Sale | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from indemnification provisions					$ 5,500,000
Walden e-Learning, LLC | Discontinued Operations, Disposed of by Sale | Asset Pledged as Collateral
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount receivable, noncurrent															$ 74,000,000
Restricted cash															$ 83,600,000