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Transactions and balances with related parties (Narrative) (Details) $ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($)
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Laminadora Vista Hermosa Company, S.A. de C.V [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  |  |  | $ 182,256
Interest |  |  |  | 915
Balance amount |  |  |  | 183,171
Laminadora Vista Hermosa Company, S.A. de C.V [Member] | USD [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  |  | $ 9,272,000 |
Operadora Compania Mexicana de Tubos S.A. de C.V. [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  |  |  | 37,347
Interest |  |  |  | 885
Balance amount |  |  |  | 38,232
Operadora Compania Mexicana de Tubos S.A. de C.V. [Member] | USD [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  |  | 1,900,000 |
Compania Manufacturera de Tubos, S.A. de C.V. [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  |  |  | 43,433
Interest |  |  |  | 1,039
Balance amount |  |  |  | 44,472
Compania Manufacturera de Tubos, S.A. de C.V. [Member] | USD [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  |  | $ 2,209,600 |
Industrias CH, S.A.B. de C.V. [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  | $ 479,368 |  | 499,278
Interest |  | 61,978 |  | 19,653
Balance amount |  | 550,619 |  | 518,931
Value added tax payables |  | 9,273 |  |
Industrias CH, S.A.B. de C.V. [Member] | USD [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | $ 25,400,000 |  |  |
Industrias CH, S.A.B. de C.V. [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan |  | 186,752 |  | 186,752
Borrowings |  | 780,989 |  | 730,278
Interest |  | 37,602 |  | 21,881
Balance amount |  | 230,370 |  | 211,347
Value added tax payables |  | 6,016 |  | 2,714
Perfiles Comerciales Sigosa, S.A. de C.V. [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Amount received |  | 428,367 |  |
Balance amount |  | $ 142,268 |  | $ 579,047

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