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Financial information by segments (Schedule of Information by Region) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Net sales $ 35,869,314 $ 34,171,201 $ 35,678,253
Cost of sales 29,211,724 30,067,141 30,563,315
Gross profit 6,657,590 4,104,060 5,114,938
Administrative expenses (2,019,328) 1,637,425 1,080,012
Other income (expenses), net 546,749 (136,582) 15,052
Interest income 107,826 145,995 312,821
Interest expense (53,746) (55,049) (16,511)
Exchange rate gain (loss), net (363,164) (784,583) (146,896)
Income (loss) before income taxes 4,875,927 1,636,416 4,199,392
Income taxes 2,077,844 3,276,274 752,462
Net income (loss) for the year 2,798,083 (1,639,858) 3,446,930
Depreciation and amortization 1,452,271 1,108,629 1,112,418
Total assets 45,503,647 44,014,759 48,853,823
Total liabilities 12,484,988 11,404,982 13,344,820
Acquisitions of property, plant and equipment 951,205 1,271,420 1,994,465
Mexico [Member]      
Disclosure of operating segments [line items]      
Net sales 19,660,889 18,530,672 20,507,794
Cost of sales 15,459,258 14,934,575 15,715,761
Gross profit 4,201,631 3,596,097 4,792,033
Administrative expenses (1,117,817) 848,495 592,218
Other income (expenses), net (52,605) 175,412 11,367
Interest income 107,604 145,729 307,279
Interest expense (5,108) 3,438 52,226
Exchange rate gain (loss), net 483,822 628,044 445,289
Income (loss) before income taxes 2,755,145 2,093,313 5,015,976
Income taxes 1,747,568 3,505,015 905,482
Net income (loss) for the year 1,007,577 (1,411,702) 4,110,494
Depreciation and amortization 693,362 577,048 587,407
Total assets 33,386,043 32,935,743 40,617,874
Total liabilities 6,944,579 7,253,713 8,458,465
Acquisitions of property, plant and equipment 278,700 785,818 1,552,587
USA [Member]      
Disclosure of operating segments [line items]      
Net sales 5,549,781 7,120,360 9,246,444
Cost of sales 5,677,638 7,752,776 9,294,352
Gross profit (127,857) (632,416) (47,908)
Administrative expenses (240,726) 267,756 267,905
Other income (expenses), net (505,946) (71,324) 3,685
Interest income 222 266 5,542
Interest expense (16,104) (84,621) (99,985)
Exchange rate gain (loss), net (1,510) (2,745) 7,522
Income (loss) before income taxes 123,001 (910,458) (399,049)
Income taxes 118,926 (236,598) 7,145
Net income (loss) for the year 4,075 (673,860) (406,194)
Depreciation and amortization 332,186 260,760 268,635
Total assets 9,237,831 8,419,771 10,181,967
Total liabilities 4,797,682 4,219,817 10,815,692
Acquisitions of property, plant and equipment 41,054 278,467 433,154
Brazil [Member]      
Disclosure of operating segments [line items]      
Net sales 10,659,259 8,520,169 5,924,015
Cost of sales 8,075,253 7,379,790 5,553,202
Gross profit 2,583,806 1,140,379 370,813
Administrative expenses (660,785) 521,174 219,889
Other income (expenses), net 11,854 32,494  
Interest income 0 0  
Interest expense (66,007) (110,919) (103,141)
Exchange rate gain (loss), net 1,096,416 177,314 (602,747)
Income (loss) before income taxes 748,744 298,478 (554,964)
Income taxes 211,350 7,857 (160,165)
Net income (loss) for the year 537,394 290,621 (394,799)
Depreciation and amortization 426,723 270,821 256,376
Total assets 5,807,121 6,002,701 6,733,362
Total liabilities 3,670,075 3,274,908 2,750,043
Acquisitions of property, plant and equipment 631,451 207,135 8,724
Eliminations Between Segments [Member]      
Disclosure of operating segments [line items]      
Interest expense 33,473 137,053 134,389
Exchange rate gain (loss), net (1,215,564) (18,030) 3,040
Income (loss) before income taxes 1,249,037 155,083 137,429
Net income (loss) for the year 1,249,037 155,083 137,429
Total assets (2,927,348) (3,343,456) (8,679,380)
Total liabilities $ (2,927,348) $ (3,343,456) $ (8,679,380)