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Contingencies (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2019
MXN ($)
Jan. 29, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Nov. 06, 2017
USD ($)
Sep. 05, 2017
USD ($)
Dec. 31, 2004
USD ($)
Jul. 26, 2004
USD ($)
Disclosure of contingent liabilities in business combination [line items]                      
Accounts payable         $ 4,179,830   $ 4,390,413        
Amount of lawsuit       $ 5,880              
Amount of tax payments and expenses increase (decrease)   $ 2,323,700                  
USD [Member]                      
Disclosure of contingent liabilities in business combination [line items]                      
Environmental liabilities $ 2,600   $ 2,600                
Accounts payable 1,000   1,000                
Accumulated liabilities $ 1,600   $ 1,600                
Amount of claims the payments                 $ 1,400    
Amount of add up               $ 5,000      
Non-adjusting events after reporting period [member] | USD [Member]                      
Disclosure of contingent liabilities in business combination [line items]                      
Amount of penalty paid           $ 200          
Pacific Steel [Member] | USD [Member]                      
Disclosure of contingent liabilities in business combination [line items]                      
Contingent amount to pay                   $ 138 $ 200