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Segment Information - Financial Information of Segments (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Net revenue from sales and services R$ 89,297,975 R$ 90,697,983 R$ 79,230,014
Operating income (expense): 1,300,552 1,899,354 2,792,742
Share of profit (loss) of joint-ventures and associates (12,145) (14,779) 20,673
Income before financial result, income and social contribution taxes 1,288,407 1,884,575 2,813,415
Financial result, net (506,854) (113,536) (474,296)
Income before income and social contribution taxes 781,553 1,771,039 2,339,119
Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 149,662 139,905 108,936
Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 89,297,975 90,697,983 79,230,014
Ultragaz [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 7,094,823 7,043,246 6,071,002
Operating income (expense): 353,522 35,567 255,935
Share of profit (loss) of joint-ventures and associates (5) 12 1,245
Ultragaz [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 3,794 2,879 2,178
Ultragaz [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 7,091,029 7,040,367 6,068,824
Ipiranga [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 75,452,481 76,477,640 66,950,501
Operating income (expense): 1,615,398 1,396,574 2,357,125
Share of profit (loss) of joint-ventures and associates 1,790 576 1,212
Ipiranga [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 535 2,919 1,003
Ipiranga [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 75,451,946 76,474,721 66,949,498
Oxiteno [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 4,254,237 4,748,428 3,959,416
Operating income (expense): (26,288) 457,128 141,350
Share of profit (loss) of joint-ventures and associates 532 880 1,417
Oxiteno [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 22,265 6,325 919
Oxiteno [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 4,231,971 4,742,103 3,958,497
Ultracargo [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 540,758 493,649 438,360
Operating income (expense): 78,834 124,720 75,042
Share of profit (loss) of joint-ventures and associates 1,370 1,350 1,578
Ultracargo [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 78,390 82,573 54,174
Ultracargo [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 462,368 411,076 384,186
Extrafarma [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 2,060,568 2,027,988 1,868,919
Operating income (expense): (724,398) (118,329) (37,721)
Extrafarma [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 0    
Extrafarma [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 2,060,569 2,027,988 1,868,919
Reportable segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 89,402,867 90,790,951 79,288,198
Operating income (expense): 1,297,068 1,895,660 2,791,731
Share of profit (loss) of joint-ventures and associates 3,687 2,818 5,452
Reportable segments [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 104,984 94,696 58,274
Reportable segments [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 89,297,883 90,696,255 79,229,924
All other segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 44,770 46,937 50,752
Operating income (expense): 3,484 3,694 1,011
Share of profit (loss) of joint-ventures and associates (15,832) (17,597) 15,221
All other segments [member] | Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services 44,678 45,209 50,662
All other segments [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Net revenue from sales and services R$ 92 R$ 1,728 R$ 90