Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) € in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Mar. 11, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Nov. 30, 2016 USD ($)
Surety Bond
Debt Instrument [Line Items]
Guarantee amount, maximum potential amount of payments	$ 16,938,000	$ 16,938,000			$ 25,582,000
Guarantor obligations, deemed unnecessary and cancelled	9,000
Cash Collateralized Letter Of Credit - Spain Tax Audits
Debt Instrument [Line Items]
Letters of credit outstanding, amount	10,600,000	$ 10,600,000	€ 9,443		5,500,000	€ 5,036
Non-Collateralized Surety Bond - UAM Brazil | Surety Bond
Debt Instrument [Line Items]
Guarantee amount, maximum potential amount of payments							$ 15,300,000
Cost of surety bond							$ 1,400,000
Guarantor obligations, term		five
Cash Collateralized Letter Of Credit - Spain Tax Audits, Extension of Audit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	24,200,000	$ 24,200,000		€ 21,600
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 125,800,000	$ 125,800,000			$ 127,300,000