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Discontinued Operations and Assets Held for Sale - Schedule of carrying amounts of the major classes of assets and liabilities classified as held for sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disposal Group, Including Discontinued Operation, Assets [Abstract]    
Total assets held for sale $ 1,917,435 $ 3,807,529
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]    
Total liabilities held for sale 702,256 1,354,893
Discontinued Operations, Held-for-sale    
Disposal Group, Including Discontinued Operation, Assets [Abstract]    
Cash and cash equivalents 270,164 333,455
Receivables, net 113,386 209,704
Property and equipment, net 259,471 784,198
Goodwill and tradenames 1,202,496 1,668,971
Operating lease assets 136,806 399,345
Other assets 183,742 446,532
Valuation allowance on held-for-sale disposal groups (248,630) (43,079)
Total assets held for sale 1,917,435 3,799,126
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]    
Deferred revenue and student deposits 87,793 176,255
Operating leases, including current portion 151,413 388,202
Long-term debt, seller notes and finance leases, including current portion 171,451 304,355
Other liabilities 291,599 486,081
Disposal Group, Held-for-sale, Not Discontinued Operations    
Disposal Group, Including Discontinued Operation, Assets [Abstract]    
Total assets held for sale 0 8,403
UniNorte Brazil | Disposal Group, Held-for-sale, Not Discontinued Operations    
Disposal Group, Including Discontinued Operation, Assets [Abstract]    
Property and equipment, net $ 0 $ 8,403