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Basis of Presentation and Principles of Consolidation -Basis of Presentation (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2023 USD ($)
General and administrative expenses allocated from iStar | $ 14.1
Interest expense allocated from iStar | 8.0
General and Administrative |
Stock-based compensation expense allocated from iStar | $ 1.8

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line allocated from iStar. + References No definition available. + Details
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Namespace Prefix: | stho_
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Period Type: | duration

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- Definition Amount of the cost of borrowed funds accounted for as interest expense allocated from iStar. + References No definition available. + Details
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Namespace Prefix: | stho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement allocated from iStar. + References No definition available. + Details
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Namespace Prefix: | stho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |