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Segment Information - Financial Information of Segments (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | R$ 90,697,983 | R$ 79,230,014 | R$ 76,740,033
Operating income (expense): | 1,899,354 | 2,792,742 | 3,069,874
Share of profit (loss) of joint-ventures and associates | (14,779) | 20,673 | 7,476
Income before financial result, income and social contribution taxes | 1,884,575 | 2,813,415 | 3,077,350
Financial result, net | (113,536) | (474,296) | (842,576)
Income before income and social contribution taxes | 1,771,039 | 2,339,119 | 2,234,774
Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 139,905 | 108,936 | 99,703
Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 90,697,983 | 79,230,014 | 76,740,033
Ultragaz [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 7,043,246 | 6,071,002 | 5,365,106
Operating income (expense): | 35,567 | 255,935 | 267,272
Share of profit (loss) of joint-ventures and associates | 12 | 1,245 | (39)
Ultragaz [member] | Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 2,879 | 2,178 | 2,942
Ultragaz [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 7,040,367 | 6,068,824 | 5,362,164
Ipiranga [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 76,473,421 | 66,950,501 | 65,793,696
Operating income (expense): | 1,396,574 | 2,357,125 | 2,364,014
Share of profit (loss) of joint-ventures and associates | (18,169) | (19,777) | (23,178)
Ipiranga [member] | Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 935 | 1,003 |
Ipiranga [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 76,472,486 | 66,949,498 | 65,793,696
Oxiteno [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 4,748,428 | 3,959,416 | 3,701,413
Operating income (expense): | 457,128 | 141,350 | 311,525
Share of profit (loss) of joint-ventures and associates | 880 | 1,417 | 975
Oxiteno [member] | Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 6,325 | 919 | 2,519
Oxiteno [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 4,742,103 | 3,958,497 | 3,698,894
Ultracargo [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 493,649 | 438,360 | 355,412
Operating income (expense): | 124,720 | 75,042 | 127,739
Share of profit (loss) of joint-ventures and associates | 1,350 | 1,578 | (27)
Ultracargo [member] | Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 82,573 | 54,174 | 48,941
Ultracargo [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 411,076 | 384,186 | 306,471
Extrafarma [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 2,027,988 | 1,868,919 | 1,578,605
Operating income (expense): | (118,329) | (37,721) | (3,848)
Extrafarma [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 2,027,988 | 1,868,919 | 1,578,605
Reportable segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 90,786,732 | 79,288,198 | 76,794,232
Operating income (expense): | 1,895,660 | 2,791,731 | 3,066,702
Share of profit (loss) of joint-ventures and associates | (15,927) | (15,537) | (22,269)
Reportable segments [member] | Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 92,712 | 58,274 | 54,402
Reportable segments [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 90,694,020 | 79,229,924 | 76,739,830
All other segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 51,156 | 50,752 | 45,504
Operating income (expense): | 3,694 | 1,011 | 3,172
Share of profit (loss) of joint-ventures and associates | 1,148 | 36,210 | 29,745
All other segments [member] | Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | 47,193 | 50,662 | 45,301
All other segments [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net revenue from sales and services | R$ 3,963 | R$ 90 | R$ 203

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