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ACQUISITIONS (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Nov. 22, 2013
Dec. 31, 2014
Other intangible assets | Minimum      
Acquisitions      
Weighted-average useful life subject to amortization acquired 14 years    
Other intangible assets | Maximum      
Acquisitions      
Weighted-average useful life subject to amortization acquired 16 years    
2014 Acquisitions      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     $ 823,025us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AcquisitionsIn2014Member
Estimated goodwill deductible for tax purposes     149,840us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AcquisitionsIn2014Member
2014 Acquisitions | Network affiliations      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     498,600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AcquisitionsIn2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_NetworkAffiliationsMember
2014 Acquisitions | Decaying advertiser base      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     78,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AcquisitionsIn2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_DecayingAdvertiserBaseMember
2014 Acquisitions | Other intangible assets      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     245,525us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AcquisitionsIn2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
MEG Stations      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     125,200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_MediaGeneralMember
Estimated goodwill deductible for tax purposes     58,698us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= sbgi_MediaGeneralMember
MEG Stations | Network affiliations      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     54,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_MediaGeneralMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_NetworkAffiliationsMember
MEG Stations | Decaying advertiser base      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     19,200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_MediaGeneralMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_DecayingAdvertiserBaseMember
MEG Stations | Other intangible assets      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     51,700us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_MediaGeneralMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
KSNV      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     62,700us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_KsnvMember
Estimated goodwill deductible for tax purposes     48,699us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= sbgi_KsnvMember
KSNV | Network affiliations      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     44,775us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_KsnvMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_NetworkAffiliationsMember
KSNV | Decaying advertiser base      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     12,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_KsnvMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_DecayingAdvertiserBaseMember
KSNV | Other intangible assets      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     5,825us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_KsnvMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Allbritton      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     564,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AllbrittonCompaniesMember
Allbritton | Network affiliations      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     356,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AllbrittonCompaniesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_NetworkAffiliationsMember
Allbritton | Decaying advertiser base      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     38,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AllbrittonCompaniesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_DecayingAdvertiserBaseMember
Allbritton | Other intangible assets      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     168,700us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_AllbrittonCompaniesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Other      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     71,025us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_OtherAcquisitionsIn2014Member
Estimated goodwill deductible for tax purposes     42,443us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= sbgi_OtherAcquisitionsIn2014Member
Other | Network affiliations      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     42,625us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_OtherAcquisitionsIn2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_NetworkAffiliationsMember
Other | Decaying advertiser base      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     9,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_OtherAcquisitionsIn2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sbgi_DecayingAdvertiserBaseMember
Other | Other intangible assets      
Acquisitions      
Fair value of identifiable definite-lived intangible assets acquired     $ 19,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sbgi_OtherAcquisitionsIn2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Barrington Broadcasting Company, LLC | Network affiliations      
Acquisitions      
Amortization period   15 years  
Barrington Broadcasting Company, LLC | Decaying advertiser base      
Acquisitions      
Amortization period   10 years