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Contingencies (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
USD ($)
Jan. 29, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
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         $ 4,390,413 $ 3,984,898        
Amount of lawsuit   $ 5,880                
USD [Member]                    
Disclosure of contingent liabilities in business combination [line items]                    
Environmental liabilities $ 2,600   $ 2,700              
Accounts payable 1,000   1,000              
Accumulated liabilities $ 1,600   $ 1,700              
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