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Discontinued Operations and Assets Held for Sale - Narrative (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Nov. 02, 2020
USD ($)
Nov. 02, 2020
BRL (R$)
Sep. 11, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on Brazil held-for-sale disposal group $ 57,714,000 $ 3,768,000      
Discontinued Operations, Disposed of by Sale | Walden e-Learning, LLC          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration received from dispositions         $ 1,480,000,000
Termination fee         $ 88,000,000
Brazil | Anima | Discontinued Operations, Disposed of by Sale | Rede          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration received from dispositions     $ 765,000,000 R$ 4,400,000,000  
Cash consideration     660,700,000 3,800,000,000  
Superior proposal, incremental earn-out     $ 35,300,000 R$ 203,000,000  
Brazil | Anima | Discontinued Operations | Rede          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on Brazil held-for-sale disposal group $ 32,400,000