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Income Taxes - Reconciliation of Principal differences between income taxes computed at the statutory rate and the Group's provision for income taxes (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes      
Statutory income tax rate 30.00% 30.00% 30.00%
Differences between accounting and tax bases, primarily tax inflation gain that is not recognized for accounting purposes 10.00% 1.00% 4.00%
Asset tax   5.00%  
Tax loss carryforwards (2.00%) (20.00%) (10.00%)
2014 Tax Reform 1.00% 19.00% 1.00%
Foreign operations 5.00% 4.00% (2.00%)
Disposition of investment     10.00%
Share of income in associates and joint ventures, net (5.00%) (4.00%)  
Exchange of Convertible Debentures for Warrants of UHI     1.00%
Effective income tax rate 39.00% 35.00% 34.00%