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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Effective Income Taxes Rate Reconciliation [Line Items]
Tax expense at U.S. statutory rates									$ 8,630us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 8,894us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 10,486us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax expense, net of federal benefit									1,249us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,192us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,356us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net									178us-gaap_IncomeTaxReconciliationOtherAdjustments	105us-gaap_IncomeTaxReconciliationOtherAdjustments	42us-gaap_IncomeTaxReconciliationOtherAdjustments
Change in valuation allowance on loss carry forwards									(7)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(51)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(34)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Tax Benefit Continuing Operations									10,050sga_IncomeTaxBenefitContinuingOperations	10,140sga_IncomeTaxBenefitContinuingOperations	11,850sga_IncomeTaxBenefitContinuingOperations
Discontinued operations									0us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems	148us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems	(89)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems
Income tax provision	$ 3,050us-gaap_IncomeTaxExpenseBenefit	$ 2,180us-gaap_IncomeTaxExpenseBenefit	$ 3,193us-gaap_IncomeTaxExpenseBenefit	$ 1,627us-gaap_IncomeTaxExpenseBenefit	$ 2,230us-gaap_IncomeTaxExpenseBenefit	$ 2,820us-gaap_IncomeTaxExpenseBenefit	$ 3,130us-gaap_IncomeTaxExpenseBenefit	$ 1,812us-gaap_IncomeTaxExpenseBenefit	$ 10,050us-gaap_IncomeTaxExpenseBenefit	$ 9,992us-gaap_IncomeTaxExpenseBenefit	$ 11,939us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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