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Costs and Expenses by Nature - Summary of Expenses by Nature/Purpose (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Expense By Nature [abstract]      
Commodity cost (natural gas) R$ (6,137,104) R$ (3,867,044) R$ (4,885,497)
Raw materials (4,631,436) (3,289,845) (3,231,169)
Personnel expenses (1,997,881) (2,533,429) (2,244,252)
Depreciation and amortization (2,504,384) (2,340,854) (2,287,877)
Railroad transportation and port elevation expenses (2,128,043) (1,897,975) (1,867,196)
Electricity purchased for resale (968,503) (927,913)
Construction cost (1,020,176) (885,630) (813,341)
Natural gas transportation cost (1,074,441) (753,603) (703,500)
Other transport (25,143)
Selling expenses (23,638) (23,387) (26,168)
Expenses with third-party services (751,486)
Other (897,789) (731,869) (460,161)
Total expenses by nature (22,160,024) (17,251,549) (16,519,161)
Cost of sales (19,864,248) (14,999,823) (14,616,985)
Selling expenses (723,419) (661,907) (666,114)
General and administrative expenses (1,572,357) (1,589,819) (1,236,062)
Total cost and expenses R$ (22,160,024) R$ (17,251,549) R$ (16,519,161)