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Due to Shareholders of Acquired Companies - Summary of Amounts Due to Shareholders of Acquired Companies (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Total due to shareholders of acquired companies $ 43,110 $ 71,785
Less: Current portion of due to shareholders of acquired companies 23,065 34,745
Due to shareholders of acquired companies, less current portion 20,045 37,040
Universidade Anhembi Morumbi (UAM Brazil)    
Business Acquisition [Line Items]    
Total due to shareholders of acquired companies $ 28,577 45,206
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%  
University of St. Augustine for Health Sciences, LLC (St. Augustine)    
Business Acquisition [Line Items]    
Total due to shareholders of acquired companies $ 11,550 11,550
Interest Rate % 7.00%  
Faculdade Porto-Alegrense (FAPA)    
Business Acquisition [Line Items]    
Total due to shareholders of acquired companies $ 1,806 3,084
IADE Group    
Business Acquisition [Line Items]    
Total due to shareholders of acquired companies $ 1,177 2,374
Interest Rate % 3.00%  
Monash South Africa (MSA)    
Business Acquisition [Line Items]    
Total due to shareholders of acquired companies $ 0 $ 9,571