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Business and Geographic Segment Information - Schedule of Assets by Geographic Areas (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Assets $ 6,930,524 $ 7,391,723
Operating Segments | Brazil    
Segment Reporting Information [Line Items]    
Assets 1,131,655 1,256,364
Operating Segments | Mexico    
Segment Reporting Information [Line Items]    
Assets 966,869 969,400
Operating Segments | Andean & Iberian    
Segment Reporting Information [Line Items]    
Assets 2,107,779 2,117,317
Operating Segments | Central America & U.S. Campuses    
Segment Reporting Information [Line Items]    
Assets 365,437 376,070
Operating Segments | EMEAA    
Segment Reporting Information [Line Items]    
Assets 753,076 1,022,569
Operating Segments | Online & Partnerships    
Segment Reporting Information [Line Items]    
Assets 1,256,671 1,294,147
Corporate    
Segment Reporting Information [Line Items]    
Assets $ 349,037 $ 355,856