Other Long-Term Debt - Summary of Other Long-Term Debt (Parenthetical) (Details) - Promissory Note $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Debt Instrument annual principal installment amount	$ 26
Debt Instrument annual principal installment commencement month year	2007-01
Debt Instrument due in annual principal installment , maturity month year	2017-01
Notes issued, interest rate	6.31%

Debt instrument maturity month year.

No definition available.

Name:	sbsaa_DebtInstrumentMaturityMonthYear
Namespace Prefix:	sbsaa_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument principal installment commencement month year.

+ References

No definition available.

+ Details

Name:	sbsaa_DebtInstrumentPrincipalInstallmentCommencementMonthYear
Namespace Prefix:	sbsaa_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=sbsaa_PromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: