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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% |  |  |  |  |  |  |  |  |

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