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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details)
€ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 11, 2020
EUR (€)
Nov. 30, 2016
USD ($)
Surety Bond        
Debt Instrument [Line Items]        
Guarantee amount, maximum potential amount of payments $ 16,929,000 $ 17,094,000    
Cash Collateralized Letter Of Credit - Spain Tax Audits        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount $ 11,100,000 11,500,000    
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 $ 25,500,000   € 21,600  
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount $ 83,600,000 $ 83,600,000