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Represent the number of markets in which broadcasting and media stations are operated.

+ References

No definition available.

+ Details

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- Definition

Represents the number of television station with attributable interest of 15% for sell off.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Represents the number of television stations in the same market entering into an agreement that the FCC will closely scrutinize.

+ References

No definition available.

+ Details

Name:	sbgi_NumberOfTelevisionStationSameMarketAgreement
Namespace Prefix:	sbgi_
Data Type:	xbrli:integerItemType
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- Definition

Represents the the number of waivers the entity is considering seeking.

+ References

No definition available.

+ Details

Name:	sbgi_NumberOfWaiversSought
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- Definition

Represents the percentage of the ad time on a particular station if it owns or controls another station in the same market that the FCC need to be considered a company an owner of a station if the companies has a JSA.

+ References

No definition available.

+ Details

Name:	sbgi_PercentageOfAdTimeForCompanyOwnership
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

Name:	dei_LegalEntityAxis=sbgi_CunninghamBroadcastingCorporationMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	sbgi_RelatedPartyTransactionsByTypeOfServicesAxis=sbgi_JointSalesAgreementsMember
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sbgi_AllbrittonCompaniesMember
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COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) (USD $)	Mar. 31, 2015 item	Mar. 31, 2014	Apr. 15, 2014 item	Aug. 01, 2014 item
COMMITMENTS AND CONTINGENCIES
Number of television stations in the same market entering into an agreement	2
Number of television stations with attributable interest			1
Percentage of ad time to be considered an owner			15.00%
Number of waivers sought	1sbgi_NumberOfWaiversSought
Revenue	$ 504,775,000us-gaap_Revenues	$ 412,648,000us-gaap_Revenues
JSA
COMMITMENTS AND CONTINGENCIES
Revenue	10,900,000	11,000,000
Allbritton
COMMITMENTS AND CONTINGENCIES
Number of markets				7
Cunningham \| Allbritton \| WTAT
COMMITMENTS AND CONTINGENCIES
Price of assets sold				14,000,000