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Intangible assets (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]        
Right of use R$ 574,517 R$ 626,427    
Right of use (574,517) (626,427)    
Right of use 75,052 103,853    
Rights of use were written off 44,976 108,406    
Leases Related To Contract Asset [Member]        
IfrsStatementLineItems [Line Items]        
Right of use 276,893 276,893    
Right of use (276,893) (276,893)    
Leases Related To Concession Agreements And Program Contract [Member]        
IfrsStatementLineItems [Line Items]        
Right of use 222,572 245,681 R$ 269,561 R$ 292,824
Right of use (222,572) (245,681) R$ (269,561) R$ (292,824)
Leases Related To Concession Agreements And Program Contract [Member] | Costs [Member]        
IfrsStatementLineItems [Line Items]        
Right of use 405,431 405,446    
Right of use (405,431) (405,446)    
Leases Related To Concession Agreements And Program Contract [Member] | Accumulated Amortizations [Member]        
IfrsStatementLineItems [Line Items]        
Right of use 182,859 159,765    
Right of use (182,859) (159,765)    
Vehicles [member]        
IfrsStatementLineItems [Line Items]        
Right of use [1] 153,384 142,003    
Right of use [1] (153,384) (142,003)    
Properties [Member]        
IfrsStatementLineItems [Line Items]        
Right of use [1] 11,711 6,570    
Right of use [1] (11,711) (6,570)    
Office equipment [member]        
IfrsStatementLineItems [Line Items]        
Right of use [1] 5,826 9,841    
Right of use [1] (5,826) (9,841)    
Other assets [member]        
IfrsStatementLineItems [Line Items]        
Right of use [1] 15,301    
Right of use [1] (15,301)    
Accumulated Amortization [Member]        
IfrsStatementLineItems [Line Items]        
Right of use [1] 95,869 69,862    
Right of use [1] R$ (95,869) R$ (69,862)    
[1] From January to December 2022, costs and accumulated amortization totaling R$ 44,976, referring to expired rights of use, were written off (from January to December 2021 – R$ 108,406).