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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 ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Surety Bond        
Debt Instrument [Line Items]        
Guarantee amount, maximum potential amount of payments   $ 23,036,000   $ 22,204,000
Cash Collateralized Letter Of Credit - Spain Tax Audits        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   5,500,000 € 5,036 5,036,000
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 obligation, term P5Y      
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 127,000,000   $ 139,000,000