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Short-term debt (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Aug. 17, 1998
Disclosure of detailed information about borrowings [line items]          
Principal amount outstanding   $ 5,700   $ 5,936  
Medium-term notes of Simec [Member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rate         10.50%
Principal amount outstanding   $ 5,700   $ 5,936  
Medium-term notes of Simec [Member] | USD [Member]          
Disclosure of detailed information about borrowings [line items]          
Principal amount outstanding $ 300   $ 300