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Financial information by segments (Schedule of Information by Region) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Net sales $ 35,678,253 $ 28,700,450 $ 27,515,565
Cost of sales (30,563,315) (23,994,526) (22,775,593)
Gross profit income 5,114,938 4,705,924 4,739,972
Administrative expenses (1,080,012) (1,238,943) (1,277,487)
Other income (expenses), net 15,052 6,934 (36,198)
Interest income 312,821 252,291 140,033
Interest expense 16,511 54,404 40,170
Exchange rate gain (loss), net (146,896) (654,362) 1,774,984
Income (loss) before income taxes 4,199,392 3,017,440 5,301,134
Income taxes 752,462 1,122,809 936,394
Net income (loss) for the year 3,446,930 1,894,631 4,364,740
Other information:      
Depreciation and amortization 1,112,418 1,465,759 1,429,381
Total assets 48,853,823 45,976,531 41,879,728
Total liabilities 13,344,820 11,658,995 8,648,055
Acquisitions of property, plant and equipment 1,994,465 3,039,501 3,100,259
Mexico [Member]      
Disclosure of operating segments [line items]      
Net sales 20,507,794 17,125,369 16,361,808
Cost of sales (15,715,761) (13,340,648) (13,724,880)
Gross profit income 4,792,033 3,784,721 2,636,928
Administrative expenses (592,218) (753,676) (901,849)
Other income (expenses), net 11,367 (98,915) (40,134)
Interest income 307,279 252,074 139,886
Interest expense 52,226 (7,459) 15,053
Exchange rate gain (loss), net 445,289 (1,291,909) 2,343,393
Income (loss) before income taxes 5,015,976 1,884,836 4,163,171
Income taxes 905,482 786,902 678,020
Net income (loss) for the year 4,110,494 1,097,934 3,485,151
Other information:      
Depreciation and amortization 587,407 677,665 620,354
Total assets 40,617,874 32,878,144 33,152,640
Total liabilities 8,458,465 1,134,438 4,161,650
Acquisitions of property, plant and equipment 1,552,587 2,394,541 2,169,375
USA [Member]      
Disclosure of operating segments [line items]      
Net sales 9,246,444 8,370,999 9,339,527
Cost of sales (9,294,352) (7,814,180) (7,332,094)
Gross profit income (47,908) 556,819 2,007,433
Administrative expenses (267,905) (257,001) (298,967)
Other income (expenses), net 3,685 105,849 (1,481,573)
Interest income 5,542 217 147
Interest expense (99,985) (50,962) 45,120
Exchange rate gain (loss), net 7,522 (26,256) 42,727
Income (loss) before income taxes (399,049) 328,666 3,187,793
Income taxes 7,145 322,444 256,089
Net income (loss) for the year (406,194) 6,222 2,931,704
Other information:      
Depreciation and amortization 268,635 538,699 551,650
Total assets 10,181,967 10,548,895 9,684,303
Total liabilities 10,815,692 10,760,999 9,893,536
Acquisitions of property, plant and equipment 433,154 622,785 816,586
Brazil [Member]      
Disclosure of operating segments [line items]      
Net sales 5,924,015 3,204,082 1,814,230
Cost of sales (5,553,202) (2,839,698) (1,718,619)
Gross profit income 370,813 364,384 95,611
Administrative expenses (219,889) (228,266) (76,671)
Other income (expenses), net  
Interest income    
Interest expense (103,141) (65,186) 50,980
Exchange rate gain (loss), net (602,747) 1,861 765,684
Income (loss) before income taxes (554,964) 72,793 733,644
Income taxes (160,165) 13,463 2,285
Net income (loss) for the year (394,799) 59,330 731,359
Other information:      
Depreciation and amortization 256,376 249,395 257,377
Total assets 6,733,362 5,356,860 5,293,891
Total liabilities 2,750,043 2,570,925 2,325,325
Acquisitions of property, plant and equipment 8,724 22,175 114,298
Eliminations Between Segments [Member]      
Disclosure of operating segments [line items]      
Other income (expenses), net   1,477,637
Interest expense 134,389 69,203 (70,983)
Exchange rate gain (loss), net 3,040 661,942 (1,376,820)
Income (loss) before income taxes 137,429 731,145 (2,783,474)
Net income (loss) for the year 137,429 731,145 (2,783,474)
Other information:      
Total assets (8,679,380) (2,807,367) (6,463,293)
Total liabilities $ (8,679,380) $ (2,807,925) $ (7,940,930)