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Financial assets and liabilities - Summary of Sensitivity Analysis on Interest Rates on Loans and Borrowings (Detail)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
Probable [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate R$ 628,702
Probable [member] | Cash and cash equivalents [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 1,623,771
Probable [member] | Marketable securities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 487,145
Probable [member] | Lease and concession in installments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (121,902)
Probable [member] | Leases [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (371,433)
Probable [member] | Derivative financial instruments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 1,327,786
Probable [member] | Loans, borrowings and debentures [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (2,244,669)
Probable [member] | Other financial liabilities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (71,996)
25% [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (2,143,748)
25% [member] | Cash and cash equivalents [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 1,995,927
25% [member] | Marketable securities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 598,464
25% [member] | Lease and concession in installments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (152,377)
25% [member] | Leases [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (371,433)
25% [member] | Derivative financial instruments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (1,365,311)
25% [member] | Loans, borrowings and debentures [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (2,760,945)
25% [member] | Other financial liabilities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (88,073)
50% [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (2,815,858)
50% [member] | Cash and cash equivalents [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 2,385,014
50% [member] | Marketable securities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 714,627
50% [member] | Lease and concession in installments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (182,853)
50% [member] | Leases [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (371,433)
50% [member] | Derivative financial instruments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (2,073,012)
50% [member] | Loans, borrowings and debentures [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (3,184,050)
50% [member] | Other financial liabilities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (104,151)
-25% [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (356,054)
-25% [member] | Cash and cash equivalents [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 1,423,642
-25% [member] | Marketable securities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 430,749
-25% [member] | Lease and concession in installments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (91,426)
-25% [member] | Leases [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (371,433)
-25% [member] | Derivative financial instruments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 223,066
-25% [member] | Loans, borrowings and debentures [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (1,914,734)
-25% [member] | Other financial liabilities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (55,918)
-50% [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 616,606
-50% [member] | Cash and cash equivalents [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 1,116,070
-50% [member] | Marketable securities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 340,218
-50% [member] | Lease and concession in installments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (60,951)
-50% [member] | Leases [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (371,433)
-50% [member] | Derivative financial instruments [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate 1,124,171
-50% [member] | Loans, borrowings and debentures [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate (1,491,629)
-50% [member] | Other financial liabilities [member]  
Disclosure of sensitivity analysis on income for the period assuming increase and decrease in interest rates [Line Items]  
Exposure interest rate R$ (39,840)