Represents the amount of goodwill tested under Step 1 for impairment.

No definition available.

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

- Definition

Represents the minimum percentage of fair value of goodwill exceeding its carrying value.

+ References

No definition available.

+ Details

Name:	sbgi_GoodwillFairValueMinimumPercentageExceedingCarryingValue
Namespace Prefix:	sbgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the indefinite lived intangible assets deconsolidation of variable interest entities.

+ References

No definition available.

+ Details

Name:	sbgi_IndefiniteLivedIntangibleAssetsDeconsolidationOfVariableInterestEntities
Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	sbgi_NumberOfMarkets
Namespace Prefix:	sbgi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the proceeds from the sales of broadcast assets which were associated with discontinued operations.

+ References

No definition available.

+ Details

Name:	sbgi_ProceedsFromSaleOfBroadcastAssetsRelatedToDiscontinuedOperations
Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460

+ Details

Name:	us-gaap_GoodwillPurchaseAccountingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_IndefinitelivedIntangibleAssetsAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit.

+ References

+ Details

Name:	us-gaap_IndefiniteLivedLicenseAgreements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember
Namespace Prefix:
Data Type:	na
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Period Type:

GOODWILL, BROADCAST LICENSES AND OTHER INTANGIBLE ASSETS: (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012	Oct. 02, 2012
Carrying amount of our broadcast licenses
Sale of broadcast assets	$ (176,675,000)	$ (49,738,000)
Measurement period adjustments related to acquisitions		(66,320,000)	(9,535,000)
Broadcast licenses	135,075,000	101,029,000
Number of markets	79sbgi_NumberOfMarkets
Minimum percentage of excess of fair value of goodwill over its carrying value	10.00%
Goodwill tested under Step 1 for impairment				79,500,000sbgi_GoodwillEvaluatedForImpairment
Consolidated VIEs, aggregated
Carrying amount of our broadcast licenses
Broadcast licenses	16,935,000	16,768,000
Broadcast licenses.
Carrying amount of our broadcast licenses
Beginning balance	101,029,000	85,122,000
Acquisition of television stations	18,027,000	15,514,000
Sale of broadcast assets	(45,000)	(25,000)
Impairment charge	(3,240,000)
Measurement period adjustments related to acquisitions	19,355,000	418,000
Deconsolidation of variable interest entities	(51,000)
Ending balance	135,075,000	101,029,000
Broadcast licenses	21,100,000
Broadcast licenses. \| Consolidated VIEs, aggregated
Carrying amount of our broadcast licenses
Broadcast licenses	$ 16,900,000	$ 16,800,000