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Investment - Summary of Balances and Changes in Associates (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of associates [line items]
Associates, beginning	R$ 25,750	R$ 24,338	R$ 25,341
Capital reduction			(1,250)
Dividends	(2,357)	(905)	(1,220)
Share of profit (loss) of associates	2,195	2,317	1,467
Associates, ending	25,588	25,750	24,338
Transportadora sulbrasileira de gas [member]
Summary of associates [line items]
Associates, beginning	5,661	4,689	6,348
Capital reduction			(1,250)
Dividends	(2,357)	(818)	(984)
Share of profit (loss) of associates	1,846	1,790	575
Associates, ending	5,150	5,661	4,689
Oxicap Industria de Gases [member]
Summary of associates [line items]
Associates, beginning	15,934	15,366	14,458
Capital reduction			0
Dividends	0	0	0
Share of profit (loss) of associates	414	568	908
Associates, ending	16,348	15,934	15,366
Quimica da bahia Industria e Comercio [member]
Summary of associates [line items]
Associates, beginning	3,554	3,590	3,618
Capital reduction			0
Dividends	0	0	0
Share of profit (loss) of associates	(12)	(36)	(28)
Associates, ending	3,542	3,554	3,590
Metalurgica plus [member]
Summary of associates [line items]
Associates, beginning	138	228	340
Capital reduction			0
Dividends	0	0	0
Share of profit (loss) of associates	(91)	(90)	(112)
Associates, ending	47	138	228
Plenogas distribuidora de gas [member]
Summary of associates [line items]
Associates, beginning	463	465	577
Capital reduction			0
Dividends	0	(87)	(236)
Share of profit (loss) of associates	38	85	124
Associates, ending	R$ 501	R$ 463	R$ 465

X

- Definition

The cash inflow representing dividends received from associates, classified as investing activities. [Refer: Associates [member]; Dividends received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16&doctype=Standard
-URIDate 2019-03-27

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Capital Reduction in Associates

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- Definition

An entity, including an unincorporated entity such as a partnership, over which the investor has significant influence and that is neither a subsidiary nor an interest in a joint venture.

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- Definition

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Summary of associates.

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