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PROPERTY AND EQUIPMENT: (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property and equipment      
Property and equipment, gross $ 1,273,055,000us-gaap_PropertyPlantAndEquipmentGross $ 1,037,632,000us-gaap_PropertyPlantAndEquipmentGross  
Less: accumulated depreciation (520,517,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (441,561,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, Plant and Equipment, Net, Total 752,538,000us-gaap_PropertyPlantAndEquipmentNet 596,071,000us-gaap_PropertyPlantAndEquipmentNet  
Capital lease depreciation expense 3,700,000sbgi_CapitalLeasesIncomeStatementDepreciationExpense 4,000,000sbgi_CapitalLeasesIncomeStatementDepreciationExpense 3,500,000sbgi_CapitalLeasesIncomeStatementDepreciationExpense
Land and improvements      
Property and equipment      
Property and equipment, gross 55,269,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
37,517,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
 
Real estate held for development and sale      
Property and equipment      
Property and equipment, gross 113,514,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sbgi_RealEstateHeldForDevelopmentAndSaleMember
67,037,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sbgi_RealEstateHeldForDevelopmentAndSaleMember
 
Buildings and improvements      
Property and equipment      
Property and equipment, gross 192,478,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
168,441,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
 
Buildings and improvements | Minimum      
Property and equipment      
Estimated useful lives 10 years    
Buildings and improvements | Maximum      
Property and equipment      
Estimated useful lives 30 years    
Station equipment      
Property and equipment      
Property and equipment, gross 684,176,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sbgi_StationEquipmentMember
572,851,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sbgi_StationEquipmentMember
 
Station equipment | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Station equipment | Maximum      
Property and equipment      
Estimated useful lives 10 years    
Office furniture and equipment      
Property and equipment      
Property and equipment, gross 70,402,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
50,210,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Office furniture and equipment | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Office furniture and equipment | Maximum      
Property and equipment      
Estimated useful lives 10 years    
Leasehold improvements      
Property and equipment      
Property and equipment, gross 19,091,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
19,453,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Leasehold improvements | Minimum      
Property and equipment      
Estimated useful lives 10 years    
Leasehold improvements | Maximum      
Property and equipment      
Estimated useful lives 30 years    
Automotive equipment      
Property and equipment      
Property and equipment, gross 37,726,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sbgi_AutomotiveEquipmentMember
23,443,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sbgi_AutomotiveEquipmentMember
 
Automotive equipment | Minimum      
Property and equipment      
Estimated useful lives 3 years    
Automotive equipment | Maximum      
Property and equipment      
Estimated useful lives 5 years    
Capital leased assets      
Property and equipment      
Property and equipment, gross 81,625,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
81,602,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
 
Capital leased assets | Minimum      
Property and equipment      
Estimated useful lives 0 years    
Capital leased assets | Maximum      
Property and equipment      
Estimated useful lives 0 years    
Construction in progress      
Property and equipment      
Property and equipment, gross $ 18,774,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 17,078,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember