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Goodwill and Intangible Assets - Intangibles Impairment (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Impairment of goodwill $ 0     $ 13,944,000 $ 0 $ 0
Finite-lived intangible assets 142,944,000     142,944,000    
Amortization expenses       25,694,000    
Impairment of intangible assets         0 $ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
2019 55,333,000     55,333,000    
2020 55,333,000     55,333,000    
2021 32,278,000     32,278,000    
Net 142,944,000     142,944,000    
New York Code And Design Academy, Inc.            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Impairment of goodwill   $ 11,100,000 $ 2,800,000 13,900,000    
Trade names            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Indefinite-lived intangible assets 185,400,000     185,400,000 7,260,000  
Trade names | New York Code And Design Academy, Inc.            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Impairment of intangible assets 300,000 $ 2,000,000 $ 3,400,000      
Capella University            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Impairment of intangible assets 0          
Non-Degree Programs            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Impairment of goodwill       $ 13,944,000    
Strayer University            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Impairment of intangible assets 0          
Student relationships            
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]            
Useful life - acquired       3 years    
Finite-lived intangible assets 142,944,000     $ 142,944,000 0  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Net $ 142,944,000     $ 142,944,000 $ 0