Concessions payable - Additional Information (Detail) - Railroad concession payable under litigation - Rumo S.A. [member] R$ in Thousands	12 Months Ended
Dec. 31, 2021 BRL (R$)
Disclosure of Concessions Payable And Judicial Deposits [line items]
Recognized indemnification amount	R$ 479,563
Gain on reversal of lease liabilities related to other income (expenses)	348,319
Gain on reversal of lease liabilities related to financial result	R$ 131,243

The gain on settlements of litigation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 98
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_98_f&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_GainsOnLitigationSettlements
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration