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Commitments and Contingencies - Other Loss Contingencies (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 12, 2014
Apr. 30, 2013
Dec. 31, 2017
USD ($)
defendant
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 27, 2017
Jul. 31, 2015
USD ($)
Loss Contingencies [Line Items]              
Long-term indemnification assets     $ 98,493 $ 97,606 $ 2,084   $ 2,084
UAM Brazil              
Loss Contingencies [Line Items]              
Noncontrolling interest, noncontrolling owners, ownership percent   49.00%          
Brazil              
Loss Contingencies [Line Items]              
Estimate of possible contingency loss     55,000        
Discontinued Operations, Held-for-sale              
Loss Contingencies [Line Items]              
Long-term indemnification assets     935 1,202      
Repayment Guarantee for Loans that Financed a Portion of the Purchase Price              
Loss Contingencies [Line Items]              
Percentage of shares as guarantee of payment obligations 75.00%            
Repayment Guarantee for Obligations Under the Purchase Agreement for the Seller Notes              
Loss Contingencies [Line Items]              
Percentage of shares as guarantee of payment obligations 25.00%            
Pending Litigation              
Loss Contingencies [Line Items]              
Contingent liabilities recorded     18,000 15,000      
Pending Litigation | Discontinued Operations, Held-for-sale              
Loss Contingencies [Line Items]              
Contingent liabilities recorded     $ 4,000 3,000      
Pending Litigation | Hunan International Economics University (HIEU)              
Loss Contingencies [Line Items]              
Number of defendants (defendant) | defendant     5        
Pending Litigation | Hunan International Economics University (HIEU) | Financial Guarantee              
Loss Contingencies [Line Items]              
Guarantor obligations, amount of loan     $ 29,000        
Taxes, Other-Than-Income Tax              
Loss Contingencies [Line Items]              
Loss contingency, statues of limitations     10 years        
Taxes, Other-Than-Income Tax And Indemnification Assets              
Loss Contingencies [Line Items]              
Increases/(decreases) to operating income for adjustments to non-income tax contingencies and indemnification assets     $ 2,586 (18,963) $ (3,965)    
Income Tax Contingencies              
Loss Contingencies [Line Items]              
Contingent liabilities recorded     103,189 103,471      
Income Tax Contingencies | Discontinued Operations, Held-for-sale              
Loss Contingencies [Line Items]              
Contingent liabilities recorded     9,300 6,786      
Guarantee of Indebtedness of Others | Chile              
Loss Contingencies [Line Items]              
Loss contingency, noncurrent     27,073 20,636      
Guarantee amount, maximum potential amount of payments     527,000 479,000      
Guarantee Obligations              
Loss Contingencies [Line Items]              
Percent of shares of company acquired in a business combination, used as a guarantee   49.00%          
Other Noncurrent Liabilities | Taxes, Other-Than-Income Tax              
Loss Contingencies [Line Items]              
Loss contingency, noncurrent     77,258 69,088      
Other Noncurrent Liabilities | Taxes, Other-Than-Income Tax | Discontinued Operations, Held-for-sale              
Loss Contingencies [Line Items]              
Loss contingency, noncurrent     $ 7,240 $ 7,181      
Hunan Lie Ying Industry Co., Ltd | LEI Lie Ying Limited              
Loss Contingencies [Line Items]              
Noncontrolling interest, ownership percentage by parent           70.00%  
HIEU; Hunan Lie Ying Mechanic School; Hunan Lie Ying Property Management Co., Ltd.; And Hunan International Economics University Vocational Skills Training Center | Hunan Lie Ying Industry Co., Ltd              
Loss Contingencies [Line Items]              
Noncontrolling interest, noncontrolling owners, ownership percent           100.00%