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Risks and Financial Instruments - Changes in exchange rate (Detail) - BRL (R$)
Dec. 31, 2018
Dec. 31, 2017
Scenario I [member]    
Currency swaps receivable in U.S. dollars    
U.S. Dollar / Real swaps R$ 372,022 R$ 198,138
Debts/firm commitments in dollars (372,019) (198,130)
Net effect 3 8
Currency swaps payable in U.S. dollars    
Real / U.S. Dollar swaps (65) (97)
Gross margin of Oxiteno 65 97
Net effect 0 0
Options    
Gross margin of Oxiteno 7,641  
Net effect 7,641  
Interest rate swap (in Brazilian Reais) - Debentures-CRA    
Fixed rate swap - CDI (311,993) 13,691
Fixed rate debt 311,993 (13,691)
Net effect 0 0
Scenario II [member]    
Currency swaps receivable in U.S. dollars    
U.S. Dollar / Real swaps 1,039,669 690,432
Debts/firm commitments in dollars (1,039,661) (690,415)
Net effect 8 17
Currency swaps payable in U.S. dollars    
Real / U.S. Dollar swaps 8,545 7,486
Gross margin of Oxiteno (8,545) (7,486)
Net effect 0 0
Options    
Options Real / U.S. Dollar swaps 97,938  
Gross margin of Oxiteno (138,993)  
Net effect (41,055)  
Interest rate swap (in Brazilian Reais) - Debentures-CRA    
Fixed rate swap - CDI (254,409) 95,292
Fixed rate debt 254,409 (95,292)
Net effect 0 0
Scenario III [member]    
Currency swaps receivable in U.S. dollars    
U.S. Dollar / Real swaps 1,707,316 1,182,726
Debts/firm commitments in dollars (1,707,303) (1,182,700)
Net effect 13 26
Currency swaps payable in U.S. dollars    
Real / U.S. Dollar swaps 17,154 15,069
Gross margin of Oxiteno (17,154) (15,069)
Net effect 0 0
Options    
Options Real / U.S. Dollar swaps 244,572  
Gross margin of Oxiteno (285,627)  
Net effect (41,055)  
Interest rate swap (in Brazilian Reais) - Debentures-CRA    
Fixed rate swap - CDI (188,047) 192,204
Fixed rate debt 188,047 (192,204)
Net effect R$ 0 R$ 0