Significant Accounting Policies, Income Taxes (Predecessor) (Details)	6 Months Ended
Jul. 05, 2022
United Maritime Predecessor [Member]
Income Taxes [Abstract]
Tax rate on U.S.-source gross transportation income	4.00%

Percentage of tax rate on U.S.-source gross transportation income.

No definition available.

Name:	usea_TaxRateOnUSSourceGrossTransportationIncome
Namespace Prefix:	usea_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration