Represents the amount of borrowings that will be drawn on a delayed basis.

No definition available.

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

- Definition

Represents the amount of financing costs that are capitalized during the period related to the amendment of debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of debt issued, as a percentage of its par value.

+ References

No definition available.

+ Details

Name:	sbgi_DebtInstrumentIssuanceAsPercentageOfParValue
Namespace Prefix:	sbgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the tender offers commenced for purchase price as a percentage of the face value related to debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Represents the redemption price of the debt instrument as a percentage of the principal amount of the notes plus accrued and unpaid interest, plus a "make-whole premium" as set forth in the indenture.

+ References

No definition available.

+ Details

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

- Definition

Represents the maximum percentage of the original principal amount of the debt instrument that the entity may redeem with net cash proceeds from certain equity offerings.

+ References

No definition available.

+ Details

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

- Definition

The floor rate for the variable rate base of the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Increase of additional borrowings on existing and new debt instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

+ Details

Name:	us-gaap_DebtInstrumentIncreaseAdditionalBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 26

-Paragraph 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings.

+ 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 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 34

-Paragraph 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

NOTES PAYABLE AND COMMERCIAL BANK FINANCING (Details) (USD $)	3 Months Ended	6 Months Ended		0 Months Ended			0 Months Ended			6 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 28, 2013 5.375% Senior Unsecured Notes, due 2021	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021	Jun. 30, 2013 5.375% Senior Unsecured Notes, due 2021	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021 Period prior to April 1, 2016	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021 Period on or prior to April 1, 2016	Apr. 09, 2013 Term Loan A Bank Credit Agreement	Jun. 30, 2013 Term Loan A Bank Credit Agreement	Apr. 09, 2013 Term Loan B Bank Credit Agreement	Jun. 30, 2013 Term Loan B Bank Credit Agreement	Jun. 28, 2013 6.125% Senior Unsecured Notes, due 2022	Jun. 30, 2013 6.125% Senior Unsecured Notes, due 2022	Oct. 31, 2012 6.125% Senior Unsecured Notes, due 2022	Jun. 30, 2013 Revolving line of credit Bank Credit Agreement	Apr. 09, 2013 Revolving line of credit Bank Credit Agreement
Notes Payable And Commercial Bank Financing
Amount of draw under incremental loan commitment used to finance acquisition					$ 600,000,000				$ 500,000,000		$ 400,000,000
Debt instrument, stated interest rate payable (as a percent)				5.375%	5.375%	5.375%							6.125%	6.125%	6.125%
Percentage of par value at which debt was issued					100.00%
Redemption price of the debt instrument (as a percent)							100.00%
Maximum percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings								35.00%
Variable rate basis										LIBOR		LIBOR				LIBOR
Interest rate margin (as a percent)										2.25%		2.25%				2.25%
LIBOR floor (as a percent)												0.75%
Borrowing capacity																	100,000,000
Amount drawn on delayed basis									445,000,000
Loss from extinguishment of debt	16,283,000	16,283,000	335,000								16,300,000
Deferred financing costs related to amendment											7,300,000
Interest expense											4,800,000
Purchase price in tender offers commenced as a percentage of face value				100.00%									100.00%
Face amount of outstanding notes				$ 600,000,000									$ 500,000,000