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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 6) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2012
Accrued Liabilities      
Compensation and employee health insurance $ 56,871,000us-gaap_EmployeeRelatedLiabilitiesCurrent $ 44,800,000us-gaap_EmployeeRelatedLiabilitiesCurrent  
Interest 33,347,000us-gaap_InterestPayableCurrent 25,133,000us-gaap_InterestPayableCurrent  
Deferred revenue 27,037,000us-gaap_DeferredRevenueCurrent 20,128,000us-gaap_DeferredRevenueCurrent  
Programming related obligations 70,344,000sbgi_ProgramRelatedObligations 42,658,000sbgi_ProgramRelatedObligations  
Other accruals relating to operating expenses 58,524,000us-gaap_OtherAccruedLiabilitiesCurrent 49,466,000us-gaap_OtherAccruedLiabilitiesCurrent  
Total accrued liabilities 246,123,000us-gaap_AccruedLiabilitiesCurrent 182,185,000us-gaap_AccruedLiabilitiesCurrent  
Network affiliation agreements | FOX      
Accrued Liabilities      
Other accruals relating to operating expenses     25,000,000us-gaap_OtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= sbgi_FoxBroadcastCompanyMember
/ us-gaap_TypeOfArrangementAxis
= sbgi_NetworkAffiliationAgreementsMember
Accrued Liabilities      
Amount paid pursuant to the agreements     $ 25,000,000sbgi_ContractualObligationsCashPaid
/ dei_LegalEntityAxis
= sbgi_FoxBroadcastCompanyMember
/ us-gaap_TypeOfArrangementAxis
= sbgi_NetworkAffiliationAgreementsMember