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Financial instruments (Schedule of Book Value of Assets and liabilities Denominated in Foreign Currency) (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Short - term assets   $ 24,362,988   $ 22,410,136
Short - term liabilities   8,426,766   7,286,477
Currency risk [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Short - term assets   12,061,901   11,176,625
Short - term liabilities   5,821,467   4,843,976
Net monetary asset position in foreign currency   $ 6,240,434   $ 6,332,649
Currency risk [Member] | USD [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Net monetary asset position in foreign currency $ 313,036   $ 335,545