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Segment Information - Revenue from Operations Abroad (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of segment information [line items]      
Revenue R$ 81,241,102 R$ 89,297,975 R$ 90,697,983
Brazil [member]      
Summary of segment information [line items]      
Revenue 79,364,726 87,927,198 89,183,342
Mexico [member]      
Summary of segment information [line items]      
Revenue 239,968 220,021 207,615
Uruguay [member]      
Summary of segment information [line items]      
Revenue 59,606 41,648 48,096
Venezuela [member]      
Summary of segment information [line items]      
Revenue     68,877
Other Latin American countries [member]      
Summary of segment information [line items]      
Revenue 647,469 418,368 425,973
United States [member]      
Summary of segment information [line items]      
Revenue 590,926 437,669 465,840
Far East [member]      
Summary of segment information [line items]      
Revenue 91,428 74,093 96,394
Europe [member]      
Summary of segment information [line items]      
Revenue 151,150 118,917 138,347
Other [member]      
Summary of segment information [line items]      
Revenue R$ 95,829 R$ 60,061 R$ 63,499