Commitments and Contingencies - Schedule of Contractual Obligations, Commitments and Contingencies (Detail) $ in Thousands	Mar. 31, 2017 USD ($)
Long-Term Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	$ 503
Payments due in 2 years	561
Payments due in 3 years	596
Payments due in 4 years	634
Payments due in 5+ years	5,044
Contractual obligations, commitments and contingencies	7,338
Operating Leases [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	545
Payments due in 2 years	402
Payments due in 3 years	336
Payments due in 4 years	243
Payments due in 5+ years	59
Contractual obligations, commitments and contingencies	1,585
Interest on Outstanding Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	396
Payments due in 2 years	400
Payments due in 3 years	366
Payments due in 4 years	328
Payments due in 5+ years	803
Contractual obligations, commitments and contingencies	$ 2,293

Commitment And Contingencies [Line Items]

No definition available.

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- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=ssy_OperatingLeasesMember
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- Details

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