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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) - USD ($)
1 Months Ended
Nov. 30, 2016
Jun. 30, 2019
Dec. 31, 2018
Surety Bond      
Debt Instrument [Line Items]      
Guarantee amount, maximum potential amount of payments   $ 22,503,000 $ 22,204,000
Cash Collateralized Letter Of Credit - Spain Tax Audits      
Debt Instrument [Line Items]      
Letters of credit outstanding, amount   5,700,000 5,700,000
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