XML 130 R113.htm IDEA: XBRL DOCUMENT v3.8.0.1
Financial Instruments (Details)
$ / shares in Units, $ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
$ / shares
Dec. 31, 2017
MXN ($)
Jul. 31, 2015
USD ($)
Financial Instruments        
Principal amount     $ 123,550,897  
UHI | Warrants issued by UHI        
Financial Instruments        
Principal amount       $ 1,125
Stock spot price | $ / shares $ 402 $ 404    
Expected volatility rate 32.00% 32.00%    
UHI | Convertible debenture due 2025        
Financial Instruments        
Principal amount $ 1,125   $ 16,606,463  
Convertible debentures at the company's option for equity stake of UHI percentage 30.00%      
Minimum | Temporary investments        
Financial Instruments        
Maturity period 3 months      
Minimum | UHI | Convertible debenture due 2025        
Financial Instruments        
Expected weighted average cost of capital 8.00%      
Maximum | Temporary investments        
Financial Instruments        
Maturity period 1 year      
Maximum | UHI | Convertible debenture due 2025        
Financial Instruments        
Expected weighted average cost of capital 10.00%