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Commitments and contingencies (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Commitments and contingencies [Abstract]
Performance and surety bonds	$ 32,100,000	$ 26,100,000
Letters of credit	$ 0	$ 0

X

- Definition

Amount of letters of credit that is available for the future payment of malpractice claims.

+ References

No definition available.

+ Details

Name:	sdhc_MalpracticeLossContingencyLettersOfCredit
Namespace Prefix:	sdhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of performance and surety bonds that are available for the future payment of malpractice claims.

+ References

No definition available.

+ Details

Name:	sdhc_MalpracticeLossContingencyPerformanceAndSuretyBonds
Namespace Prefix:	sdhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration