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Risks and Financial Instruments - Changes in exchange rate (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Scenario I [member]    
Currency swaps receivable in U.S. dollars    
U.S. Dollar / Real swaps R$ 700,499 R$ 372,022
Debts/firm commitments in dollars (700,465) (372,019)
Net effect 34 3
Currency swaps payable in U.S. dollars    
Real / U.S. Dollar swaps 376 (65)
Gross margin of Oxiteno (376) 65
Net effect 0 0
Options    
Options Real / U.S. Dollar swaps 0 0
Gross margin of Oxiteno 0 0
Net effect 0 0
Interest rate swap (in Brazilian Reais) - Debentures-CRA    
Fixed rate swap - DI (195,123) (311,993)
Fixed rate debt 195,123 311,993
Net effect 0 0
Scenario II [member]    
Currency swaps receivable in U.S. dollars    
U.S. Dollar / Real swaps 1,668,202 1,039,669
Debts/firm commitments in dollars (1,668,031) (1,039,661)
Net effect 172 8
Currency swaps payable in U.S. dollars    
Real / U.S. Dollar swaps 62,559 8,545
Gross margin of Oxiteno (62,559) (8,545)
Net effect 0 0
Options    
Options Real / U.S. Dollar swaps 42,101 97,938
Gross margin of Oxiteno (42,101) (97,938)
Net effect 0 0
Interest rate swap (in Brazilian Reais) - Debentures-CRA    
Fixed rate swap - DI (137,260) (254,409)
Fixed rate debt 137,260 254,409
Net effect 0 0
Scenario III [member]    
Currency swaps receivable in U.S. dollars    
U.S. Dollar / Real swaps 2,635,905 1,707,316
Debts/firm commitments in dollars (2,635,596) (1,707,303)
Net effect 309 13
Currency swaps payable in U.S. dollars    
Real / U.S. Dollar swaps 124,742 17,154
Gross margin of Oxiteno (124,742) (17,154)
Net effect 0 0
Options    
Options Real / U.S. Dollar swaps 102,917 244,572
Gross margin of Oxiteno (102,917) (244,572)
Net effect 0 0
Interest rate swap (in Brazilian Reais) - Debentures-CRA    
Fixed rate swap - DI (74,027) (188,047)
Fixed rate debt 74,027 188,047
Net effect R$ 0 R$ 0