Dispositions (Details) $ in Thousands			1 Months Ended			3 Months Ended			6 Months Ended
	Mar. 06, 2020 USD ($)	Jan. 10, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 HKD ($)	Jan. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) numberOfPerformanceMetrics	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Chile impairment						$ 445,085,000		$ 470,000	$ 448,853,000	$ 470,000
LEI Lie Ying Limited | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds From Divestiture Of Businesses, Final Holdback Payment			$ 18,300,000	$ 141,647
Proceeds From Divestiture Of Business, Amount Receivable, Noncurrent							$ 25,900,000
Education Holding Cost Rica, S.R.L. | Costa Rica Operations | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received from dispositions		$ 15,000
Total Chile impairment							$ 25,000
Gain (loss) on sale of business					$ 18,600,000
Proceeds from divestiture of businesses, net of cash divested		1,800,000
Education Holding Cost Rica, S.R.L. | Costa Rica Operations | Discontinued Operations, Disposed of by Sale | Certain Performance Metrics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received from dispositions		$ 7,000,000	5,000,000			$ 5,000,000			5,000,000
Contingent consideration period		2 years
Amounts of material contingent liabilities remaining		$ 30,000
Contingent consideration, performance metrics met | numberOfPerformanceMetrics						1
Exeter Street Holdings, LLC | NewSchool of Architecture and Design, LLC | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received from dispositions	$ 1
Gain (loss) on sale of business						$ 5,700,000
Ownership percent	100.00%
Consideration receivable, ratably, quarterly basis over next four years			$ 2,800,000			$ 2,800,000			$ 2,800,000
Receivable agreement period	4 years
Disposal Group, Including Discontinued Operation, Consideration, Subsidies	$ 7,300,000