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Transactions and balances with related parties (Narrative) (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Industrias CH, S.A.B. de C.V. [Member]      
Disclosure of transactions between related parties [line items]      
Loan   $ 506,354 $ 479,368
Interest   93,816 61,978
Balance amount   614,449 550,619
Value added tax payables   14,279 9,273
Industrias CH, S.A.B. de C.V. [Member] | USD [Member]      
Disclosure of transactions between related parties [line items]      
Loan $ 24,400    
Industrias CH, S.A.B. de C.V. [Member]      
Disclosure of transactions between related parties [line items]      
Loan   186,752 186,752
Borrowings   858,510 780,989
Interest   49,404 37,602
Balance amount   244,061 230,370
Value added tax payables   7,905 6,016
Perfiles Comerciales Sigosa, S.A. de C.V. [Member]      
Disclosure of transactions between related parties [line items]      
Amount received   $ 150,233 7,536,068
Balance amount     $ 142,268