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Expenses by Nature - Expenses by Nature (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expenses by nature details [abstract]      
Raw materials and materials for use and consumption R$ 81,819,820 R$ 83,116,950 R$ 71,217,345
Personnel expenses 2,415,581 2,513,586 2,231,556
Freight and storage 1,170,870 1,178,990 1,117,467
Depreciation and amortization 844,647 812,489 704,544
Amortization of right to use assets 300,058    
Advertising and marketing 206,103 173,988 192,441
Services provided by third parties 322,589 328,361 351,227
Other expenses 474,081 709,710 679,810
Total 87,553,749 88,834,074 76,494,390
Cost of products and services sold 83,187,109 84,537,368 72,431,473
Selling and marketing 2,610,384 2,601,617 2,486,389
General and administrative 1,726,253 1,625,839 1,576,528
Total R$ 87,553,749 R$ 88,834,074 R$ 76,494,390