Due to Shareholders of Acquired Companies - Summary of Amounts Due to Shareholders of Acquired Companies (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	Nov. 21, 2013
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 45,391	$ 71,785
Less: Current portion of due to shareholders of acquired companies	23,820	34,745
Due to shareholders of acquired companies, less current portion	21,571	37,040
Universidade Anhembi Morumbi (UAM Brazil)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	30,912	45,206
University of St. Augustine for Health Sciences, LLC (St. Augustine)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 11,395		$ 11,550	$ 14,000
Interest Rate %	7.00%
IADE Group
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 1,943	3,084
Monash South Africa (MSA)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 1,141	2,374
Interest Rate %	3.00%
Monash South Africa (MSA)
Business Acquisition [Line Items]
Total due to shareholders of acquired companies	$ 0	$ 9,571