Commitments and Contingencies - Additional Information (Detail) - Trace Regional Hospital [Member] - Trace Forward Capital Plan [Member] $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($)
Commitment And Contingencies [Line Items]
Total amount for expansion, upgrade and improve hospital	$ 2,000
Amount spent for expansion, upgrade and improve hospital	404
Amount to be spent for expansion, upgrade and improve hospital	$ 916

Property and business expansion amount committed to expensed.

No definition available.

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Namespace Prefix:	ssy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration