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Summary of Significant Accounting Policies (Details Textual) (USD $) | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 03, 2014 | Sep. 23, 2014 | Nov. 21, 2013 | Oct. 02, 2012 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Four-for-three stock split |  |  |  |  |  | The stock split increased the Company’s issued and outstanding shares of common stock from 3,659,753 shares of Class A Common Stock and 597,504 shares of Class B Common Stock to 4,879,186 and 796,672 shares, respectively. |  |
Number of stock options outstanding having antidilutive effect |  |  |  |  |  | 45,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 13,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 93,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Concentration Risk, Market Risk |  |  |  |  |  | 43.00%us-gaap_ConcentrationRiskPercentage1 | 44.00%us-gaap_ConcentrationRiskPercentage1 | 44.00%us-gaap_ConcentrationRiskPercentage1
Depreciation expense |  |  |  |  |  | $ 6,648,000 us-gaap_Depreciation | $ 6,716,000 us-gaap_Depreciation | $ 6,805,000 us-gaap_Depreciation
Interest expense related to the amortization of debt issuance costs |  |  |  |  |  | 187,000 us-gaap_AmortizationOfFinancingCosts | 204,000 us-gaap_AmortizationOfFinancingCosts | 231,000 us-gaap_AmortizationOfFinancingCosts
Write-off debt issuance costs |  |  |  |  |  | 0 us-gaap_WriteOffOfDeferredDebtIssuanceCost | 55,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost | 0 us-gaap_WriteOffOfDeferredDebtIssuanceCost
Net book value of deferred costs |  |  |  |  |  | 636,000 us-gaap_OtherDeferredCostsNet | 823,000 us-gaap_OtherDeferredCostsNet |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 6,165 us-gaap_TreasuryStockSharesAcquired | 2,179 us-gaap_TreasuryStockSharesAcquired | 2,924 us-gaap_TreasuryStockSharesAcquired
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  | $ 41.15 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 43.98 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 27.30 us-gaap_TreasuryStockAcquiredAverageCostPerShare
Advertising and promotion costs |  |  |  |  |  | 3,056,000 us-gaap_MarketingAndAdvertisingExpense | 3,225,000 us-gaap_MarketingAndAdvertisingExpense | 3,182,000 us-gaap_MarketingAndAdvertisingExpense
Special cash dividend declared on Classes A and B Common Stock | $ 1.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.80 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.80 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.80 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.24 us-gaap_CommonStockDividendsPerShareDeclared
Dividend paid | 8,200,000 us-gaap_DividendsCommonStockStock | 1,100,000 us-gaap_DividendsCommonStockStock | 10,300,000 us-gaap_DividendsCommonStockStock | 7,000,000 us-gaap_DividendsCommonStockStock | 1,100,000 us-gaap_DividendsCommonStockStock |  |  |
Number Of Broadcast Licenses |  |  |  |  |  | 99 sga_NumberOfBroadcastLicenses |  |
Number Of Market Serving |  |  |  |  |  | 25 sga_NumberOfMarketServing |  |
Dividends Payable, Amount Per Share | $ 0.20 us-gaap_DividendsPayableAmountPerShare |  |  |  |  |  |  |
Common Class [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | 29,700,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Minimum [Member] | Common Class [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | 60,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Maximum [Member] | Common Class [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 75,800,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Favorable Lease Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortized over the lives of the leases term range |  |  |  |  |  | 4 years |  |
Favorable Lease Agreements [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortized over the lives of the leases term range |  |  |  |  |  | 26 years |  |

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