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Consolidated Statements of Changes In Equity (Parenthetical)	Dec. 31, 2021
Maximum
Ownership Percentage	50.00%

Represents the ownership percentage of a consolidated entity.

No definition available.

Name:	smhi_OwnershipPercentage
Namespace Prefix:	smhi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: