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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)

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- Definition The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_99&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_103&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_102&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_99&doctype=Standard -URIDate 2021-03-24 + Details
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