SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Restricted Cash
Restricted cash to be held, related to removal of analog equipment	$ 0.2	$ 0.2
Acquisitions and divestments, pending agreements
Restricted Cash
Purchase price to be deposited into escrow account	$ 25.0

Represents the part of consideration to be paid by the entity in the significant acquisition or disposal, which is to be deposited into escrow account.

No definition available.

Name:	sbgi_SignificantAcquisitionsAndDisposalsAcquisitionCostsAmountToBeDepositedIntoEscrowAccount
Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant