Name:	sbgi_GainLossOnEquityAndCostMethodInvestments
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Represents the aggregated payments received under the LMA which are treated as a liability for the prepayment of the purchase price of the stations, and which are therefore omitted from consolidated liabilities.

No definition available.

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Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
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The carrying amount for the obligation incurred under a television programming license agreement. A liability is recorded when the cost of each program is known or reasonably determinable, the program material has been accepted by the licensee in accordance with the conditions of the license agreement and the program is available for its first showing or telecast.

No definition available.

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Represents the initial term of certain outsourcing agreements entered into with license station owners.

No definition available.

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Namespace Prefix:	sbgi_
Data Type:	xbrli:durationItemType
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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

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Data Type:	xbrli:monetaryItemType
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:
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Namespace Prefix:
Data Type:	na
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Name:	us-gaap_ConsolidationItemsAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix:
Data Type:	na
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Name:	dei_LegalEntityAxis=sbgi_CunninghamBroadcastingCorporationMember
Namespace Prefix:
Data Type:	na
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