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Investments in Financial Instruments - Additional Information (Details)
$ / shares in Units, $ in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
$ / shares
Jul. 31, 2015
MXN ($)
Jun. 30, 2015
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Dec. 31, 2015
MXN ($)
Financial Instruments              
Notional Amount       $ 123,550,897      
Exercise price per warrant | $ / shares $ 0.01            
Warrants           $ 1,951.0 $ 30,582,427
Cumulative gain in fair value from Convertible Debentures issued by UHI reclassified to other finance income, Before Tax             $ 4,718,175
Exercised warrants amount $ 107.4 $ 1,695,524          
2019              
Financial Instruments              
Notional Amount       989,156      
Maturities of investment       137,699      
2020              
Financial Instruments              
Notional Amount       10,492,489      
Maturities of investment       62,207      
thereafter              
Financial Instruments              
Maturities of investment       $ 87,699      
UHI              
Financial Instruments              
Ownership interest in associate 10.00% 10.00% 7.80% 10.00% 10.00%    
Investment in Convertible Debenture due 2025 | UHI              
Financial Instruments              
Notional Amount $ 1,125.0            
Interest Rate Receivable 1.50% 1.50%          
Additional shares to be issued on the conversion of the investment in convertible debenture expressed as a percentage of equity interest in issuer 30.00% 30.00%