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Significant Accounting Policies, Basis of Presentation (Predecessor) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jul. 05, 2022	Dec. 31, 2021	Dec. 31, 2020
United Maritime Predecessor [Member]
Basis of Presentation [Abstract]
Additional administrative expenses	$ 0.3	$ 0.6	$ 0.3

X

- Definition

Additional administrative expenses, including legal, professional, treasury and regulatory compliance and other costs normally incurred by a listed public entity that would have been reflected in the financial statements had the Subsidiary operated independently of the Parent.

+ References

No definition available.

+ Details

Name:	usea_AdditionalAdministrativeExpenses
Namespace Prefix:	usea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	usea_BasisOfPresentationAbstract
Namespace Prefix:	usea_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	dei_LegalEntityAxis=usea_UnitedMaritimePredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: