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Fair value measurement - Narrative (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value Disclosures [Abstract] |  |
Transfers to/from levels | $ 0 | $ 0

X
- Definition Amount of transfers in between levels. + References No definition available. + Details
Name: | uhg_FairValueTransferFromLevelsAmount
Namespace Prefix: | uhg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration