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Disclosure - Loans, financing, debentures and hedge derivative financial instruments - Summary of Debentures (Detail)
 1 Months Ended 12 Months Ended
Nov. 30, 2019
Dec. 31, 2018
BRL (R$)
Mar. 31, 2018
Oct. 31, 2017
BRL (R$)
Jul. 31, 2017
Apr. 30, 2017
May 31, 2016
Dec. 31, 2020
BRL (R$)
Debentures first issue [member] | Tequimar [member]                
Summary of loans debentures and finance leases [line items]                
Simple nominative nonconvertible unsecured registered debentures 90,000              
Debentures fourth issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Simple nominative nonconvertible unsecured registered debentures             500  
Debentures fifth issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Second series simple nominative nonconvertible unsecured registered debentures           352,361    
Interest               93.9% of DI
Debentures sixth issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Simple nominative nonconvertible unsecured registered debentures     1,725,000   1,500,000      
Debentures seventh issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Second series simple nominative nonconvertible unsecured registered debentures       213,693        
Amount:       R$ 944,077,000        
Interest               97.3% of DI
Debentures eighth issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Second series simple nominative nonconvertible unsecured registered debentures   240,000            
Amount:   R$ 900,000,000            
Interest               97.1% of DI
Debenture one [member]                
Summary of loans debentures and finance leases [line items]                
Face value unit               R$ 1,000,000,000
Final maturity               May 25, 2021
Payment of the face value               Annual as from May 2019
Interest               105.0% of DI
Payment of interest               Semiannually
Reprice               Not applicable
Debenture two [member]                
Summary of loans debentures and finance leases [line items]                
Amount:               R$ 660,139,000
Face value unit               R$ 1,000,000
Final maturity               April 18, 2022
Payment of the face value               Lump sum at final maturity
Interest               95.0% of DI
Payment of interest               Semiannually
Reprice               Not applicable
Debenture two [member] | Debentures fifth issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Second series simple nominative nonconvertible unsecured registered debentures           660,139    
Debenture three [member]                
Summary of loans debentures and finance leases [line items]                
Amount:               R$ 352,361,000
Face value unit               R$ 1,000,000
Final maturity               April 15, 2024
Payment of the face value               Lump sum at final maturity
Interest               IPCA + 4.68%
Payment of interest               Annually
Reprice               Not applicable
Debenture four [member]                
Summary of loans debentures and finance leases [line items]                
Face value unit               R$ 1,000,000
Final maturity               July 28, 2022
Payment of the face value               Annual as from July 2021
Interest               105.0% of DI
Payment of interest               Annually
Reprice               Not applicable
Debenture five [member]                
Summary of loans debentures and finance leases [line items]                
Amount:               R$ 730,384,000
Face value unit               R$ 1,000,000
Final maturity               October 24, 2022
Payment of the face value               Lump sum at final maturity
Interest               95.0% of DI
Payment of interest               Semiannually
Reprice               Not applicable
Debenture five [member] | Debentures seventh issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Second series simple nominative nonconvertible unsecured registered debentures       730,384        
Debenture six [member]                
Summary of loans debentures and finance leases [line items]                
Amount:               R$ 213,693,000
Face value unit               R$ 1,000,000
Final maturity               October 24, 2024
Payment of the face value               Lump sum at final maturity
Interest               IPCA + 4.34%
Payment of interest               Annually
Reprice               Not applicable
Debenture seven [member]                
Summary of loans debentures and finance leases [line items]                
Face value unit               R$ 1,000,000
Final maturity               March 5, 2023
Payment of the face value               Lump sum at final maturity
Interest               105.25% of DI
Payment of interest               Semiannually
Reprice               Not applicable
Debenture eight [member]                
Summary of loans debentures and finance leases [line items]                
Amount:               R$ 660,000,000
Face value unit               R$ 1,000,000
Final maturity               December 18, 2023
Payment of the face value               Lump sum at final maturity
Interest               97.5% of DI
Payment of interest               Semiannually
Reprice               Not applicable
Debenture eight [member] | Debentures eighth issue [member] | IPP [member]                
Summary of loans debentures and finance leases [line items]                
Second series simple nominative nonconvertible unsecured registered debentures   660,000            
Debenture nine [member]                
Summary of loans debentures and finance leases [line items]                
Amount:               R$ 240,000,000
Face value unit               R$ 1,000,000
Final maturity               December 15, 2025
Payment of the face value               Lump sum at final maturity
Interest               IPCA + 4.61%
Payment of interest               Annually
Reprice               Not applicable
Debenture ten [member]                
Summary of loans debentures and finance leases [line items]                
Face value unit               R$ 1,000,000
Final maturity               November 19, 2024
Payment of the face value               Lump sum at final maturity
Interest               6.47%
Payment of interest               Semiannually
Reprice               Not applicable