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Inventories - Composition of Inventories (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Summary of inventories [line items]      
Cost R$ 3,397,119 R$ 3,550,809  
Provision for losses (42,587) (37,099)  
Net balance 3,354,532 3,513,710 R$ 2,781,377
Fuels [member]      
Summary of inventories [line items]      
Cost 1,367,015 1,626,582  
Provision for losses (1,804) (3,074)  
Net balance 1,365,211 1,623,508  
Finished goods [member]      
Summary of inventories [line items]      
Cost 581,504 500,223  
Provision for losses (20,923) (18,495)  
Net balance 560,581 481,728  
Work in process [member]      
Summary of inventories [line items]      
Cost 1,412 1,637  
Net balance 1,412 1,637  
Raw Materials [member]      
Summary of inventories [line items]      
Cost 383,161 492,029  
Provision for losses (1,894) (1,835)  
Net balance 381,267 490,194  
Liquified petroleum gas [member]      
Summary of inventories [line items]      
Cost 109,362 102,748  
Provision for losses (5,761) (5,761)  
Net balance 103,601 96,987  
Consumable materials [member]      
Summary of inventories [line items]      
Cost 150,188 160,024  
Provision for losses (3,770) (5,380)  
Net balance 146,418 154,644  
Pharmaceutical hygiene beauty products member      
Summary of inventories [line items]      
Cost 583,060 417,726  
Provision for losses (5,364) (2,447)  
Net balance 577,696 415,279  
Advances to suppliers [member]      
Summary of inventories [line items]      
Cost 193,928 222,808  
Provision for losses (2,964)    
Net balance 190,964 222,808  
Properties for resale [member]      
Summary of inventories [line items]      
Cost 27,489 27,032  
Provision for losses (107) (107)  
Net balance R$ 27,382 R$ 26,925