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Investment - Summary of Amounts of Balance Sheets and Income Statements of Associates (Detail) - BRL (R$)
shares in Thousands, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Dec. 31, 2015
Summary of associates [line items]          
Current assets R$ 16,211,707 R$ 15,490,111   R$ 13,366,127  
Non-current assets 14,287,688 12,794,235   10,708,389  
Current liabilities 6,336,798 7,009,688   5,484,299  
Non-current liabilities 14,362,568 11,650,620   10,114,166  
Equity 9,800,029 9,624,038 R$ 8,476,050 R$ 8,476,051 R$ 7,974,129
Net revenue from sales and services 90,697,983 79,230,014 76,740,033    
Costs, operating expenses and income 57,533 59,360 198,972    
Net income (loss) 1,132,320 1,525,865 1,546,816    
Transportadora sulbrasileira de gas [member]          
Summary of associates [line items]          
Current assets 7,803 11,218      
Non-current assets 15,254 16,464      
Current liabilities 3,963 1,960      
Non-current liabilities 332 332      
Equity 18,762 25,390      
Net revenue from sales and services 10,595 10,522 9,955    
Costs, operating expenses and income (7,957) (5,649) (5,194)    
Net financial income and income and social contribution taxes (211)   63    
Net income (loss) R$ 2,427 R$ 4,873 R$ 4,824    
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$ 38,714 R$ 45,061      
Non-current assets 85,395 74,621      
Current liabilities 9,777 12,338      
Non-current liabilities 8,888 7,920      
Equity 105,444 99,424      
Net revenue from sales and services 53,288 52,709 R$ 52,751    
Costs, operating expenses and income (43,814) (40,769) (39,539)    
Net financial income and income and social contribution taxes (3,453) (2,144) (6,837)    
Net income (loss) R$ 6,021 R$ 9,796 R$ 6,375    
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$ 51 R$ 67      
Non-current assets 10,238 10,278      
Non-current liabilities 3,109 3,110      
Equity 7,180 7,235      
Costs, operating expenses and income (78) (90) R$ (60)    
Net financial income and income and social contribution taxes 22 (31) 49    
Net income (loss) R$ (56) R$ (121) R$ (11)    
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$ 19 R$ 175      
Non-current assets 990 1,695      
Current liabilities 21 422      
Non-current liabilities 302 427      
Equity 686 1,021      
Costs, operating expenses and income (266) 673 R$ (189)    
Net financial income and income and social contribution taxes (69) 179 (19)    
Net income (loss) R$ (335) R$ 852 R$ (208)    
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$ 64 R$ 505      
Non-current assets 2,791 2,821      
Current liabilities 123 93      
Non-current liabilities 1,334 1,500      
Equity 1,398 1,733      
Costs, operating expenses and income 399 628 R$ 574    
Net financial income and income and social contribution taxes (27) 15 68    
Net income (loss) R$ 372 R$ 643 R$ 642    
Number of shares or units held 1,384,308 1,384,308 1,384,308    
% of capital held 33.00% 33.00% 33.00%