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Commitments and Contingencies - Summary of Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
INTI Education Holdings Sdn Bhd    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, noncontrolling owners, ownership percent 10.10%  
Pearl Retail Solutions Private Limited    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, noncontrolling owners, ownership percent 10.00%  
Puttable Common Stock | INTI Education Holdings Sdn Bhd    
Redeemable Noncontrolling Interest [Line Items]    
Estimated Value as of June 30, 2018 redeemable within 12-months: $ 9,267  
Reported Value 9,267  
Puttable Common Stock | Pearl Retail Solutions Private Limited    
Redeemable Noncontrolling Interest [Line Items]    
Estimated Value as of June 30, 2018 redeemable within 12-months: 1,930  
Reported Value 1,930  
Puttable Preferred Stock | Stamford International University    
Redeemable Noncontrolling Interest [Line Items]    
Estimated Value as of June 30, 2018 redeemable within 12-months: 61  
Reported Value 61  
Puttable Non-controlling Interest    
Redeemable Noncontrolling Interest [Line Items]    
Estimated Value as of June 30, 2018 redeemable within 12-months: 11,258  
Reported Value 11,258  
Puttable common stock - not currently redeemable    
Redeemable Noncontrolling Interest [Line Items]    
Estimated Value as of June 30, 2018 redeemable within 12-months: 0  
Reported Value 1,722  
Puttable Arrangements - Common and Preferred Stock    
Redeemable Noncontrolling Interest [Line Items]    
Estimated Value as of June 30, 2018 redeemable within 12-months: 11,258  
Reported Value $ 12,980 $ 13,721