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Investment - Summary of Balances and Changes in Associates (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of associates [line items] |  |  |
Associates, beginning | R$ 24,338 | R$ 25,341 | R$ 22,731
Capital reduction |  | (1,250) |
Dividends | (905) | (1,220) | (1,264)
Share of profit (loss) of associates | 2,317 | 1,467 | 3,874
Associates, ending | 25,750 | 24,338 | 25,341
Transportadora sulbrasileira de gas [member] |  |  |
Summary of associates [line items] |  |  |
Associates, beginning | 4,689 | 6,348 | 6,001
Capital reduction |  | (1,250) |
Dividends | (818) | (984) | (865)
Share of profit (loss) of associates | 1,790 | 575 | 1,212
Associates, ending | 5,661 | 4,689 | 6,348
Oxicap Industria de Gases [member] |  |  |
Summary of associates [line items] |  |  |
Associates, beginning | 15,366 | 14,458 | 12,981
Dividends | 0 |  |
Share of profit (loss) of associates | 568 | 908 | 1,477
Associates, ending | 15,934 | 15,366 | 14,458
Quimica da bahia Industria e Comercio [member] |  |  |
Summary of associates [line items] |  |  |
Associates, beginning | 3,590 | 3,618 | 3,678
Dividends | 0 |  |
Share of profit (loss) of associates | (36) | (28) | (60)
Associates, ending | 3,554 | 3,590 | 3,618
Metalurgica plus [member] |  |  |
Summary of associates [line items] |  |  |
Associates, beginning | 228 | 340 | 71
Dividends | 0 |  |
Share of profit (loss) of associates | (90) | (112) | 269
Associates, ending | 138 | 228 | 340
Plenogas distribuidora de gas [member] |  |  |
Summary of associates [line items] |  |  |
Associates, beginning | 465 | 577 |
Dividends | (87) | (236) | (399)
Share of profit (loss) of associates | 85 | 124 | 976
Associates, ending | R$ 463 | R$ 465 | R$ 577

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- 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 + Details
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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. + References No definition available. + Details
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- Definition The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations] + References No definition available. + Details
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