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Net sales - Revenue Disaggregated by Products and Service Lines and Timing of Revenue Recognition (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | R$ 25,865,001 | R$ 20,437,835 | R$ 20,611,409
Elimination [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | (52,681) | (37,888) | (36,971)
Goods or services transferred at point in time [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 16,891,471 | 12,492,063 | 12,617,407
Goods or services transferred at point in time [member] | Natural gas distribution [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 10,447,312 | 7,372,957 | 8,636,221
Goods or services transferred at point in time [member] | Electricity trading [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 620,495 | 775,479 |
Goods or services transferred at point in time [member] | Lubricants and basic oil [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 5,546,093 | 4,283,704 | 3,916,504
Goods or services transferred at point in time [member] | Other [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 277,571 | 59,923 | 64,682
Goods or services transferred over time [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 9,026,211 | 7,983,660 | 8,030,973
Goods or services transferred over time [member] | Railroad transportation services [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 7,103,706 | 6,680,307 | 6,548,109
Goods or services transferred over time [member] | Port elevation [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 335,965 | 285,852 | 351,563
Goods or services transferred over time [member] | Construction revenue [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 1,020,176 | 885,630 | 813,341
Goods or services transferred over time [member] | Services rendered [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | R$ 566,364 | R$ 131,871 | R$ 317,960

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_113_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_114&doctype=Standard -URIDate 2021-03-24 + Details
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