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

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- Definition

Recognized savings in wages and benefits expenses.

+ References

No definition available.

+ Details

Name:	smhi_RecognizedSavingsInWagesAndBenefitsExpenses
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