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Transactions and balances with related parties (Narrative) (Details) $ in Thousands, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 12, 2017 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | $ 3,032,599 | $ 2,364,545
Interest rate |  |  |  | 0.25% | 0.25% | 0.25% | 0.25% |
Exchange rate | [1] |  | 19.23 | 18.94 |  |  |  |
USD [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Loan payable |  |  |  | $ 50,000 | $ 50,000 |  |  |
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 |  |  |
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 |  |  |  |  |  | 37,347 |  |
Industrias CH, S.A.B. de C.V. [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Loan |  |  |  |  |  | 499,278 | $ 422,338 |
Borrowings |  |  |  |  |  | 730,278 | 530,281 | 88,433
Interest |  |  |  |  |  | 19,653 | 9,200 |
Balance amount |  |  |  |  |  | 518,931 | 431,538 |
Value added tax payables |  |  |  |  |  | 2,714 |  |
Loan payable |  |  |  |  |  | 211,347 |  |
Industrias CH, S.A.B. de C.V. [Member] | USD [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Loan |  |  |  | $ 21,400,000 | $ 25,400,000 |  |  |
Industrias CH, S.A.B. de C.V. [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Loan |  |  |  |  |  | 186,752 | 89,363 |
Interest |  |  |  |  |  | 21,881 | 9,380 |
Balance amount |  |  |  |  |  | 3 | 98,743 |
Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Loan |  |  |  |  |  | 1,455,153 |  | 1,549,352
Borrowings |  |  |  |  |  |  | 1,695,921 | 1,571,048
Interest |  |  |  |  |  | 136,022 | 124,873 | 18,906
Balance amount |  |  |  |  |  | 376,790 | 1,695,921 | 1,571,048
Value added tax payables |  |  |  |  |  |  |  | 2,790
Perfiles Comerciales Sigosa, S.A. de C.V. [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Loan |  |  |  |  |  | 296,959 | 721,382 | 680,432
Borrowings |  |  |  |  |  |  | 806,397 | 705,064
Interest |  |  |  |  |  | 65,664 | 60,383 | 24,632
Balance amount |  |  |  |  |  | $ 579,047 | $ 806,397 | 705,064
Exchange rate |  | 21.9076 |  |  |  |  |  |
Exchange amount |  | $ 721,382 | $ 3,945 |  |  |  |  |
Perfiles Comerciales Sigosa, S.A. de C.V. [Member] | USD [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 32,928,400
[1] | Average exchange rate used to translate revenues, costs and expenses of the companies mentioned above.

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