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Expenses by Nature - Expenses by Nature (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses by nature details [abstract]      
Raw materials and materials for use and consumption R$ 83,116,950 R$ 71,217,345 R$ 69,027,733
Personnel expenses 2,513,586 2,231,556 2,042,985
Freight and storage 1,178,990 1,117,467 1,077,552
Depreciation and amortization 812,489 704,544 628,156
Advertising and marketing 173,988 192,441 200,011
Services provided by third parties 328,361 351,227 318,746
Lease of real estate and equipment 253,695 196,970 164,740
Other expenses 456,015 482,840 403,074
Total 88,834,074 76,494,390 73,862,997
Cost of products and services sold 84,537,368 72,431,473 70,196,945
Selling and marketing 2,670,867 2,486,389 2,220,193
General and administrative 1,625,839 1,576,528 1,445,859
Total R$ 88,834,074 R$ 76,494,390 R$ 73,862,997