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Investment - Summary of Amounts of Balance Sheets and Income Statements of Associates (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of associates [line items]        
Current assets R$ 17,489,071 R$ 15,058,055    
Non-current assets 18,761,091 16,137,417    
Current liabilities 9,240,841 5,195,069    
Non-current liabilities 17,099,056 16,165,228    
Equity 9,910,265 9,835,175 R$ 9,800,029 R$ 9,624,038
Net revenue from sales and services 81,241,102 89,297,975 90,697,983  
Costs, operating expenses and income 221,394 179,625 57,533  
Net income (loss) 927,697 402,944 1,132,320  
Transportadora sulbrasileira de gas [member]        
Summary of associates [line items]        
Current assets 10,570 12,172    
Non-current assets 12,822 14,041    
Current liabilities 2,189 2,944    
Non-current liabilities 602 626    
Equity 20,601 22,643    
Net revenue from sales and services 14,295 12,348 10,595  
Costs, operating expenses and income (6,475) (4,815) (7,957)  
Net financial income and income and social contribution taxes (437) (157) (211)  
Net income (loss) R$ 7,383 R$ 7,376 R$ 2,427  
Number of shares or units held 20,124,996 20,124,996 20,124,996  
% of capital held 25.00% 25.00% 25.00%  
Oxicap Industria de Gases [member]        
Summary of associates [line items]        
Current assets R$ 65,136 R$ 45,178    
Non-current assets 77,339 84,705    
Current liabilities 26,116 11,041    
Non-current liabilities 7,994 9,634    
Equity 108,365 109,208    
Net revenue from sales and services 58,677 43,463 R$ 53,288  
Costs, operating expenses and income (54,163) (36,791) (43,814)  
Net financial income and income and social contribution taxes (1,770) (2,483) (3,453)  
Net income (loss) R$ 2,744 R$ 4,189 R$ 6,021  
Number of shares or units held 1,987 1,987 1,987  
% of capital held 15.00% 15.00% 15.00%  
Quimica da bahia Industria e Comercio [member]        
Summary of associates [line items]        
Current assets R$ 47 R$ 71    
Non-current assets 10,146 10,147    
Current liabilities 0 0    
Non-current liabilities 3,109 3,110    
Equity 7,084 7,108    
Net revenue from sales and services 0 0 R$ 0  
Costs, operating expenses and income (24) (84) (78)  
Net financial income and income and social contribution taxes 0 12 22  
Net income (loss) R$ (24) R$ (72) R$ (56)  
Number of shares or units held 1,493,120 1,493,120 1,493,120  
% of capital held 50.00% 50.00% 50.00%  
Metalurgica plus [member]        
Summary of associates [line items]        
Current assets R$ 58 R$ 40    
Non-current assets 414 703    
Current liabilities 28 25    
Non-current liabilities 302 302    
Equity 142 416    
Net revenue from sales and services 0 0 R$ 0  
Costs, operating expenses and income (212) (213) (266)  
Net financial income and income and social contribution taxes (60) (57) (69)  
Net income (loss) R$ (272) R$ (270) R$ (335)  
Number of shares or units held 3,000 3,000 3,000  
% of capital held 33.00% 33.00% 33.00%  
Plenogas distribuidora de gas [member]        
Summary of associates [line items]        
Current assets R$ 352 R$ 151    
Non-current assets 2,196 2,440    
Current liabilities 154 34    
Non-current liabilities 890 1,167    
Equity 1,504 1,390    
Net revenue from sales and services 0 0 R$ 0  
Costs, operating expenses and income 396 285 399  
Net financial income and income and social contribution taxes (39) (29) (27)  
Net income (loss) R$ 357 R$ 256 R$ 372  
Number of shares or units held 1,384,308 1,384,308 1,384,308  
% of capital held 33.00% 33.00% 33.00%