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8. Related Parties (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Parties Details Narrative
Amortization recognized as general and administrative	R$ 11,752	R$ 18,372	R$ 16,935

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- Definition

Related parties amortization recognized as general and administrative.

+ References

No definition available.

+ Details

Name:	UGP_AmortizationRecognizedAsGeneralAndAdministrativeExpense
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	UGP_RelatedPartiesDetailsNarrativeAbstract
Namespace Prefix:	UGP_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration