Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) € in Thousands	1 Months Ended
	Nov. 30, 2016 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)
Surety Bond
Debt Instrument [Line Items]
Guarantee amount, maximum potential amount of payments		$ 25,582,000		$ 22,204,000
Cash Collateralized Letter Of Credit - Spain Tax Audits
Debt Instrument [Line Items]
Letters of credit outstanding, amount		5,600,000	€ 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 obligation, term	P5Y
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design
Debt Instrument [Line Items]
Letters of credit outstanding, amount		127,300,000		139,000,000
Amount required by the DOE to be posted		$ 125,800,000		$ 125,800,000