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Related Parties - Summary of Subsidiaries and Other Related Parties (Parenthetical) (Detail) - Stores Stores in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
LA'7 Participaes e Empreend. Imob. Ltda. [member]
Summary of related parties [line items]
Number of drugstores under rental contracts	15	16

X

- Definition

Number of drugstores under rental contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Summary of related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: