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Property, plant and equipment, intangible assets, goodwill, right-of-use assets and contract assets - Additional Information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jun. 16, 2021
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Impairment of assets and goodwill recognized   R$ 0  
Description Of Agreement Of Intangible Assets   the concession right recognized upon the business combination of Comgás, which is being amortized over the concession period on a straight line basis, considering the extension of the distribution services for another 20 years  
Cash-generating units [member]      
Disclosure of detailed information about intangible assets [line items]      
Assumptions used in discounted cash flow projections, period of long term growth   10 years  
Rumo [member]      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs   R$ 70,609 R$ 34,107
Weighted average interest rate used to capitalize borrowing costs   11.81% 8.40%
Additions R$ 184,100    
TRSP [member]      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs   R$ 7,512  
Weighted average interest rate used to capitalize borrowing costs   2.78%  
Compass Gás e Energia [member] | Contract assets      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs   R$ 33,829 R$ 36,522
Weighted average interest rate used to capitalize borrowing costs   8.45% 7.40%
Rumo S.A. [member] | Cash-generating units [member]      
Disclosure of detailed information about intangible assets [line items]      
Provision for Impairment   R$ 143,987  
Provision for Impairment related to fixed assets   143,018  
Provision for Impairment related to right-of-use assets   R$ 966