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Due to Shareholders of Acquired Companies - Additional Information (Details)
12 Months Ended 60 Months Ended
Sep. 12, 2017
USD ($)
Sep. 12, 2017
BRL (R$)
Nov. 18, 2015
Sep. 12, 2014
USD ($)
Nov. 21, 2013
USD ($)
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           $ 79,569,000   $ 210,948,000   $ 79,569,000      
Interest paid on deferred purchase price for acquisitions           (39,419,000)   0 $ 0        
Universidade Anhembi Morumbi (UAM Brazil)                          
Business Acquisition [Line Items]                          
Promissory notes payable               52,043,000          
Universidade Anhembi Morumbi (UAM Brazil) | Related Party Notes Payable                          
Business Acquisition [Line Items]                          
Loan amount           60,479,000       $ 60,479,000 R$ 200,808,000    
Number of periodic payments (installment) | installment                         9
Periodic principal payment           $ 6,720,000 R$ 22,312,000            
Number of periodic installment payments made during the period (installment) | installment                   5      
Number of periodic payment installments remaining (installment) | installment           4       4 4    
Promissory notes payable           $ 45,206,000       $ 45,206,000      
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% 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% 2.00%            
University of St. Augustine for Health Sciences, LLC (St. Augustine)                          
Business Acquisition [Line Items]                          
Promissory notes payable         $ 14,000,000 $ 11,550,000   $ 11,550,000 11,550,000 $ 11,550,000      
Ownership percentage acquired in business combinations         80.00%     20.00%          
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% 7.00%       7.00% 7.00%    
Monash South Africa (MSA)                          
Business Acquisition [Line Items]                          
Promissory notes payable           $ 9,571,000   $ 27,462,000   $ 9,571,000      
Monash South Africa (MSA) | Related Party Notes Payable                          
Business Acquisition [Line Items]                          
Interest rate           6.75%       6.75% 6.75%    
Faculdades Metropolitanas Unidas Educacionais (FMU)                          
Business Acquisition [Line Items]                          
Promissory notes payable           $ 0   $ 100,382,000   $ 0   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                      
Interest paid on deferred purchase price for acquisitions           $ (39,400,000)              
Faculdades Metropolitanas Unidas Educacionais (FMU) | Notes Payable                          
Business Acquisition [Line Items]                          
Loan amount       $ 110,310,000               R$ 259,139,000  
Financed note term     10 years                    
Interest rate     3.00%                    
Faculdades Metropolitanas Unidas Educacionais (FMU) | Certificados de Depósitos Interbancários (CDI) | Notes Payable                          
Business Acquisition [Line Items]                          
Basis spread on variable rate       3.70%