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v3.26.1

Cost Reduction Measures - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2026 USD ($)
Restructuring and Related Activities [Abstract] |
Recognized savings in wages and benefits expenses | $ 1.0

X
- Definition Recognized savings in wages and benefits expenses. + References No definition available. + Details
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Namespace Prefix: | smhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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