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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details)
€ in Thousands
1 Months Ended
Nov. 30, 2016
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Surety Bond          
Debt Instrument [Line Items]          
Guarantee amount, maximum potential amount of payments   $ 17,094,000   $ 25,582,000  
Cash Collateralized Letter Of Credit - Spain Tax Audits          
Debt Instrument [Line Items]          
Letters of credit outstanding, amount   11,500,000 € 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        
Bond term 5 years        
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design          
Debt Instrument [Line Items]          
Letters of credit outstanding, amount   $ 83,600,000   $ 127,300,000