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Legal and Regulatory Matters - United States Postsecondary Education Regulation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
United States    
Loss Contingencies [Line Items]    
Percentage of funds received 10.00%  
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design    
Loss Contingencies [Line Items]    
Letters of credit outstanding, amount $ 83,600 $ 127,300