Name:	sga_BusinessAcquisitionProformaIncomeLossFromContinuingOperationsBeforeTaxesChangesInAccountingAndExtraordinaryItems
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Data Type:	xbrli:monetaryItemType
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The pro forma amount of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	sga_BusinessAcquisitionsProformaCorporateGeneralAndAdministrativeExpenses
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The pro forma amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

No definition available.

Name:	sga_BusinessAcquisitionsProformaIncomeTaxExpensesBenefit
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
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The pro forma amount of interest expenses for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	sga_BusinessAcquisitionsProformaInterestExpenses
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
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Business acquisitions proforma non operating interest income

No definition available.

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Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
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The pro forma amount of income not normally included in Operating Costs and Expenses for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	sga_BusinessAcquisitionsProformaOperatingExpensesOther
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Data Type:	xbrli:monetaryItemType
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The pro forma amount of operating income for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	sga_BusinessAcquisitionsProformaOperatingIncome
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

No definition available.

Name:	sga_BusinessAcquisitionsProformaStationOperatingExpense
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Data Type:	num:perShareItemType
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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
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Period Type:	duration

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Data Type:	xbrli:monetaryItemType
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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

- References

No definition available.

Name:	us-gaap_BusinessCombinationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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- References

No definition available.