Commitments for Capital Expenditures - Additional Information (Detail) $ in Thousands	Dec. 31, 2021 USD ($)
Trace Forward Capital Plan [Member] \| Trace Regional Hospital [Member]
Commitment And Contingencies [Line Items]
Commitments for future capital expenditures	$ 382

Property and business expansion commitment amount.

No definition available.

Name:	ssy_PropertyAndBusinessExpansionCommitmentAmount
Namespace Prefix:	ssy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant