Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 30, 2015
Entity Listings
Entity Registrant Name	SINCLAIR BROADCAST GROUP INC
Entity Central Index Key	0000912752
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A Common Stock
Entity Listings
Entity Common Stock, Shares Outstanding		68,792,483
Class B Common Stock
Entity Listings
Entity Common Stock, Shares Outstanding		25,928,357