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DISPOSITION OF ASSETS AND DISCONTINUED OPERATIONS (Details) (USD $)
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
Mar. 01, 2013
Apr. 30, 2013
Discontinued Operations                          
Total revenues, net $ 613,818,000us-gaap_Revenues $ 494,956,000us-gaap_Revenues $ 455,136,000us-gaap_Revenues $ 412,648,000us-gaap_Revenues $ 427,715,000us-gaap_Revenues $ 338,644,000us-gaap_Revenues $ 314,154,000us-gaap_Revenues $ 282,618,000us-gaap_Revenues $ 1,976,558,000us-gaap_Revenues $ 1,363,131,000us-gaap_Revenues $ 1,061,679,000us-gaap_Revenues    
Adjustment of certain liabilities for unrecognized tax benefits             5,100,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease     11,200,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease      
WLAJ-TV                          
Discontinued Operations                          
Price of assets sold to an unrelated third party receivable in cash                       14,400,000sbgi_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceedsToBePaidInCash
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLAJTVMember
 
Total revenues, net                   600,000us-gaap_Revenues
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLAJTVMember
3,700,000us-gaap_Revenues
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLAJTVMember
   
Total income before taxes                   200,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLAJTVMember
900,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLAJTVMember
   
WLWC-TV                          
Discontinued Operations                          
Price of assets sold to an unrelated third party receivable in cash                         13,800,000sbgi_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceedsToBePaidInCash
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLWCTVMember
Total revenues, net                   1,600,000us-gaap_Revenues
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLWCTVMember
6,300,000us-gaap_Revenues
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLWCTVMember
   
Total income before taxes                   $ 400,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLWCTVMember
$ 200,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sbgi_WLWCTVMember