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Due to Shareholders of Acquired Companies - Summary of Amounts Due to Shareholders of Acquired Companies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 59,867	$ 79,569
Less: Current portion of due to shareholders of acquired companies	24,483	40,140
Due to shareholders of acquired companies, less current portion	35,384	39,429
Universidade Anhembi Morumbi (UAM Brazil)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies		45,206
Universidade Anhembi Morumbi (UAM Brazil) | Related Party Notes Payable
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 41,229
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
University of St. Augustine for Health Sciences, LLC (St. Augustine) | Related Party Notes Payable
Business Acquisition [Line Items]
Interest Rate %	7.00%
Universidad Tecnologica Centroamericana (UNITEC Honduras)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 3,016	3,813
Faculdade Porto-Alegrense (FAPA)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	2,906	3,084
IADE Group
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 1,166	2,374
IADE Group | Related Party Notes Payable
Business Acquisition [Line Items]
Interest Rate %	3.00%
Monash South Africa (MSA)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 0	9,571
CH Holding Netherlands B.V. (CH Holding)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 0	$ 3,971

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