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Commitments and Contingencies - Noncontrolling Interest Holder Put Agreements and Company Call Arrangements (Details)
RM in Thousands, $ in Thousands
12 Months Ended
Jul. 11, 2017
USD ($)
Dec. 31, 2017
USD ($)
campus
option
Dec. 31, 2017
MYR (RM)
campus
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 28, 2016
Redeemable Noncontrolling Interest [Line Items]            
Accretion of redeemable noncontrolling interests and equity   $ 12,748        
Purchase of noncontrolling interest   $ 917   $ 613 $ 4,613  
Disposal Group, Held-for-sale, Not Discontinued Operations | INTI Education Holdings Sdn Bhd            
Redeemable Noncontrolling Interest [Line Items]            
Noncontrolling interest, noncontrolling owners, ownership percent   10.10%        
INTI Education Holdings Sdn Bhd            
Redeemable Noncontrolling Interest [Line Items]            
Number of campuses of higher education institutions (campus) | campus   5 5      
Noncontrolling interest, noncontrolling owners, ownership percent   10.00%        
Pearl Retail Solutions Private Limited and Creative Arts Education Society            
Redeemable Noncontrolling Interest [Line Items]            
Noncontrolling interest, noncontrolling owners, ownership percent           45.00%
Pearl Retail Solutions Private Limited            
Redeemable Noncontrolling Interest [Line Items]            
Noncontrolling interest, noncontrolling owners, ownership percent   10.00%        
Puttable Non-controlling Interest            
Redeemable Noncontrolling Interest [Line Items]            
Total redeemable noncontrolling interests and equity   $ 11,435        
Total noncontrolling interest holder put arrangements   11,435        
Puttable Common Stock            
Redeemable Noncontrolling Interest [Line Items]            
Total redeemable noncontrolling interests and equity   9,436        
Puttable Common Stock | INTI Education Holdings Sdn Bhd            
Redeemable Noncontrolling Interest [Line Items]            
Total redeemable noncontrolling interests and equity   9,436        
Total noncontrolling interest holder put arrangements   $ 9,436        
Number of options (option) | option   1        
Noncontrolling interest, noncontrolling owners, ownership percent   10.10%        
Option exercise term   30 days 30 days      
Purchase price multiple of EBITDA   8 8      
Income before income tax, depreciation and amortization   $ 9,800 RM 40,000      
Additional purchase price multiple of EBITDA   6 6      
Option expiration term   30 days 30 days      
Puttable Common Stock | Pearl Retail Solutions Private Limited and Creative Arts Education Society            
Redeemable Noncontrolling Interest [Line Items]            
Noncontrolling interest, noncontrolling owners, ownership percent 10.00%         45.00%
Noncontrolling interest, noncontrolling owners, interest acquired 35.00%          
Purchase of noncontrolling interest $ 11,400          
Puttable Common Stock | Pearl Retail Solutions Private Limited            
Redeemable Noncontrolling Interest [Line Items]            
Total redeemable noncontrolling interests and equity   $ 1,938        
Total noncontrolling interest holder put arrangements   1,938        
Callable Noncontrolling Interest, Common Stock | Pearl Retail Solutions Private Limited and Creative Arts Education Society            
Redeemable Noncontrolling Interest [Line Items]            
Noncontrolling interest, noncontrolling owners, ownership percent           35.00%
Percentage of noncontrolling interest of ownership percentage by noncontrolling owners           78.00%
Puttable common stock - not currently redeemable            
Redeemable Noncontrolling Interest [Line Items]            
Total redeemable noncontrolling interests and equity   2,286   $ 3,125    
Total noncontrolling interest holder put arrangements   $ 0