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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) (Bank Credit Agreement, Subsequent Event, USD $)
In Millions, unless otherwise specified
0 Months Ended
Apr. 30, 2015
Term Loan B
 
Notes Payable And Commercial Bank Financing  
Additional debt commitment $ 350.0us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet
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= sbgi_BankCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= sbgi_TermLoanBMember
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= us-gaap_SubsequentEventMember
Term Loan B | LIBOR
 
Notes Payable And Commercial Bank Financing  
Interest rate margin (as a percent) 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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/ us-gaap_LongtermDebtTypeAxis
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/ us-gaap_SubsequentEventTypeAxis
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/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
LIBOR floor (as a percent) 0.75%sbgi_DebtInstrumentVariableRateBasisFloor
/ us-gaap_CreditFacilityAxis
= sbgi_BankCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= sbgi_TermLoanBMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Revolving Credit Facility
 
Notes Payable And Commercial Bank Financing  
Current borrowing facility $ 483.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sbgi_BankCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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= us-gaap_SubsequentEventMember