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Financial information by segments (Schedule of Information by Region) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | $ 34,171,201 | $ 35,678,253 | $ 28,700,450
Cost of sales |  | 30,067,141 | 30,563,315 | 23,994,526
Gross profit |  | 4,104,060 | 5,114,938 | 4,705,924
Administrative expenses |  | 1,637,425 | 1,080,012 | (1,238,943)
Other income (expenses), net |  | (136,582) | 15,052 | 6,934
Interest income |  | 145,995 | 312,821 | 252,291
Interest expense |  | (55,049) | (16,511) | (54,404)
Exchange rate gain (loss), net |  | (784,583) | (146,896) | (654,362)
Income (loss) before income taxes |  | 1,636,416 | 4,199,392 | 3,017,440
Income taxes | [1] | 3,276,274 | 752,462 | 1,122,809
Net income (loss) for the year |  | (1,639,858) | 3,446,930 | 1,894,631
Depreciation and amortization |  | 1,108,629 | 1,112,418 | 1,465,759
Total assets |  | 44,014,759 | 48,853,823 | 45,976,532
Total liabilities |  | 11,404,982 | 13,344,820 | 11,658,995
Acquisitions of property, plant and equipment |  | 1,271,420 | 1,994,465 | 3,039,501
Mexico [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 18,530,672 | 20,507,794 | 17,125,369
Cost of sales |  | 14,934,575 | 15,715,761 | 13,340,648
Gross profit |  | 3,596,097 | 4,792,033 | 3,784,721
Administrative expenses |  | 848,495 | 592,218 | (753,676)
Other income (expenses), net |  | 175,412 | 11,367 | (98,915)
Interest income |  | 145,729 | 307,279 | 252,074
Interest expense |  | 3,438 | 52,226 | (7,459)
Exchange rate gain (loss), net |  | 628,044 | 445,289 | (1,291,909)
Income (loss) before income taxes |  | 2,093,313 | 5,015,976 | 1,884,836
Income taxes |  | 3,505,015 | 905,482 | 786,902
Net income (loss) for the year |  | (1,411,702) | 4,110,494 | 1,097,934
Depreciation and amortization |  | 577,048 | 587,407 | 677,665
Total assets |  | 34,761,662 | 40,617,874 | 32,878,144
Total liabilities |  | 9,079,632 | 8,458,465 | 1,134,438
Acquisitions of property, plant and equipment |  | 785,818 | 1,552,587 | 2,394,541
USA [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 7,120,360 | 9,246,444 | 8,370,999
Cost of sales |  | 7,752,776 | 9,294,352 | 7,814,180
Gross profit |  | (632,416) | (47,908) | 556,819
Administrative expenses |  | 267,756 | 267,905 | (257,001)
Other income (expenses), net |  | (71,324) | 3,685 | 105,849
Interest income |  | 266 | 5,542 | 217
Interest expense |  | (84,621) | (99,985) | (50,962)
Exchange rate gain (loss), net |  | (2,745) | 7,522 | (26,256)
Income (loss) before income taxes |  | (910,458) | (399,049) | 328,666
Income taxes |  | (236,598) | 7,145 | 322,444
Net income (loss) for the year |  | (673,860) | (406,194) | 6,222
Depreciation and amortization |  | 260,760 | 268,635 | 538,699
Total assets |  | 8,419,771 | 10,181,967 | 10,548,895
Total liabilities |  | 4,219,817 | 10,815,692 | 10,760,999
Acquisitions of property, plant and equipment |  | 278,467 | 433,154 | 622,785
Brazil [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 8,520,169 | 5,924,015 | 3,204,082
Cost of sales |  | 7,379,790 | 5,553,202 | 2,839,698
Gross profit |  | 1,140,379 | 370,813 | 364,384
Administrative expenses |  | 521,174 | 219,889 | (228,266)
Other income (expenses), net |  | 32,494 |  |
Interest income |  | 0 |  |
Interest expense |  | (110,919) | (103,141) | (65,186)
Exchange rate gain (loss), net |  | 177,314 | (602,747) | 1,861
Income (loss) before income taxes |  | 298,478 | (554,964) | 72,793
Income taxes |  | 7,857 | (160,165) | 13,463
Net income (loss) for the year |  | 290,621 | (394,799) | 59,330
Depreciation and amortization |  | 270,821 | 256,376 | 249,395
Total assets |  | 6,002,701 | 6,733,362 | 5,356,860
Total liabilities |  | 3,274,908 | 2,750,043 | 2,570,925
Acquisitions of property, plant and equipment |  | 207,135 | 8,724 | 22,175
Eliminations Between Segments [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Interest expense |  | 137,053 | 134,389 | 69,203
Exchange rate gain (loss), net |  | (18,030) | 3,040 | 661,942
Income (loss) before income taxes |  | 155,083 | 137,429 | 731,145
Net income (loss) for the year |  | 155,083 | 137,429 | 731,145
Total assets |  | (3,343,456) | (8,679,380) | (2,807,367)
Total liabilities |  | $ (3,343,456) | $ (8,679,380) | $ (2,807,367)
[1] | For the purpose of determining the effective tax rate, the payments corresponding to taxes from previous years and expenses that were paid by various group companies derived from repair agreements during the 2019 fiscal year were not considered within the income tax expense.

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