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Description of business and summary of significant accounting policies, Deposits on Real Estate Under Option or Contract (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Deposits on Real Estate under Option or Contract [Abstract]
Write-off of deposits associated with terminated option contracts	$ 0	$ 0

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- References

No definition available.

+ Details

Name:	sdhc_DepositsOnRealEstateUnderOptionOrContractsAbstract
Namespace Prefix:	sdhc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The write-off of deposits associated with terminated option contracts during the period.

+ References

No definition available.

+ Details

Name:	sdhc_WriteOffOfDepositsAssociatedWithTerminatedOptionContracts
Namespace Prefix:	sdhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration