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Commitments and contingencies (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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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