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Due to Shareholders of Acquired Companies - Additional Information (Details)
12 Months Ended 60 Months Ended
Sep. 12, 2017
USD ($)
Sep. 12, 2017
BRL (R$)
Sep. 12, 2014
USD ($)
Nov. 21, 2013
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
installment
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
installment
Dec. 31, 2017
BRL (R$)
installment
Sep. 12, 2014
BRL (R$)
Dec. 31, 2013
installment
Business Acquisition [Line Items]                          
Promissory notes payable         $ 45,391,000 $ 71,785,000       $ 71,785,000      
Interest paid on deferred purchase price for acquisitions         (4,463,000) (39,419,000)   $ 0          
Universidade Anhembi Morumbi (UAM Brazil)                          
Business Acquisition [Line Items]                          
Promissory notes payable         $ 30,912,000 45,206,000       45,206,000      
Universidade Anhembi Morumbi (UAM Brazil) | Related Party Notes Payable                          
Business Acquisition [Line Items]                          
Loan amount           51,703,000       $ 51,703,000 R$ 200,808,000    
Number of periodic payments (installment) | installment                         9
Periodic principal payment           $ 5,745,000 R$ 22,312,000            
Number of periodic installment payments made during the period (installment) | installment                   6      
Number of periodic payment installments remaining (installment) | installment           3       3 3    
Universidade Anhembi Morumbi (UAM Brazil) | Certificados de Depósitos Interbancários (CDI) | Related Party Notes Payable                          
Business Acquisition [Line Items]                          
Basis spread on variable rate         2.00%                
Universidade Anhembi Morumbi (UAM Brazil) | Certificados de Depósitos Interbancários (CDI) | Notes Payable                          
Business Acquisition [Line Items]                          
Basis spread on variable rate         2.00%                
University of St. Augustine for Health Sciences, LLC (St. Augustine)                          
Business Acquisition [Line Items]                          
Promissory notes payable       $ 14,000,000 $ 11,395,000       $ 11,550,000        
Ownership percentage acquired in business combinations       80.00%       20.00%          
Legal Fees         $ 155,000                
Interest rate         7.00%                
Decrease to note payables                 $ 2,450,000        
University of St. Augustine for Health Sciences, LLC (St. Augustine) | Related Party Notes Payable                          
Business Acquisition [Line Items]                          
Financed note term       5 years                  
Interest rate       7.00%                  
Faculdades Metropolitanas Unidas Educacionais (FMU)                          
Business Acquisition [Line Items]                          
Promissory notes payable | R$                       R$ 250,000,000  
Faculdades Metropolitanas Unidas Educacionais (FMU) | Related Party Notes Payable                          
Business Acquisition [Line Items]                          
Liability settled $ 114,578,000 R$ 358,606,000                      
Faculdades Metropolitanas Unidas Educacionais (FMU) | Notes Payable                          
Business Acquisition [Line Items]                          
Loan amount     $ 110,310,000                 R$ 259,139,000  
Faculdades Metropolitanas Unidas Educacionais (FMU) | Certificados de Depósitos Interbancários (CDI) | Notes Payable                          
Business Acquisition [Line Items]                          
Basis spread on variable rate     3.70%