CONDENSED CONSOLIDATING FINANCIAL STATEMENTS: (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2013 5.375% Senior Unsecured Notes, due 2021	Jun. 28, 2013 5.375% Senior Unsecured Notes, due 2021	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021	Jun. 30, 2013 6.125% Senior Unsecured Notes, due 2022	Jun. 28, 2013 6.125% Senior Unsecured Notes, due 2022	Oct. 31, 2012 6.125% Senior Unsecured Notes, due 2022	Jun. 30, 2013 8.375% Senior Notes due 2018	Jun. 30, 2013 9.25% Senior Secured Second Lien Notes due 2017	Jun. 30, 2013 4.875% Notes	Jun. 30, 2013 3.0% Notes	Dec. 31, 2012 6.0% Notes	Jun. 30, 2013 Sinclair Broadcast Group, Inc.	Dec. 31, 2012 Sinclair Broadcast Group, Inc.	Jun. 30, 2013 Sinclair Broadcast Group, Inc. 4.875% Notes	Jun. 30, 2013 Sinclair Broadcast Group, Inc. 3.0% Notes	Jun. 30, 2013 Sinclair Television Group, Inc.	Dec. 31, 2012 Sinclair Television Group, Inc.	Jun. 30, 2012 Sinclair Television Group, Inc.	Dec. 31, 2011 Sinclair Television Group, Inc.	Jun. 30, 2013 Sinclair Television Group, Inc. 5.375% Senior Unsecured Notes, due 2021	Jun. 30, 2013 Sinclair Television Group, Inc. 6.125% Senior Unsecured Notes, due 2022	Jun. 30, 2013 Sinclair Television Group, Inc. 8.375% Senior Notes due 2018	Jun. 30, 2013 Sinclair Television Group, Inc. 9.25% Senior Secured Second Lien Notes due 2017	Jun. 30, 2013 Guarantor Subsidiaries and KDSM, LLC	Dec. 31, 2012 Guarantor Subsidiaries and KDSM, LLC	Jun. 30, 2012 Guarantor Subsidiaries and KDSM, LLC	Dec. 31, 2011 Guarantor Subsidiaries and KDSM, LLC	Jun. 30, 2013 Non-Guarantor Subsidiaries	Dec. 31, 2012 Non-Guarantor Subsidiaries	Jun. 30, 2012 Non-Guarantor Subsidiaries	Dec. 31, 2011 Non-Guarantor Subsidiaries	Jun. 30, 2013 Eliminations	Dec. 31, 2012 Eliminations
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)							5.375%	5.375%	5.375%	6.125%	6.125%	6.125%	8.375%	9.25%	4.875%	3.00%	6.00%			4.875%	3.00%					5.375%	6.125%	8.375%	9.25%
Debt related to STG and its subsidiaries	$ 2,449,200,000																	$ 2,305,700,000				$ 2,359,000,000
Cash	550,812,000		22,865,000		31,078,000	12,967,000																517,227,000	7,230,000	4,105,000	188,000					6,390,000	199,000	232,000	313,000	27,195,000	15,436,000	26,741,000	12,466,000
Accounts and other receivables	210,831,000		183,896,000															63,000	152,000			432,000	907,000							204,706,000	175,837,000			6,700,000	7,622,000			(1,070,000)	(622,000)
Other current assets	45,278,000		67,330,000															(197,000)	2,821,000			7,395,000	2,342,000							31,099,000	56,522,000			8,941,000	9,028,000			(1,960,000)	(3,383,000)
Assets held for sale			30,357,000																												30,357,000
Total current assets	806,921,000		304,448,000															(134,000)	2,973,000			525,054,000	10,479,000							242,195,000	262,915,000			42,836,000	32,086,000			(3,030,000)	(4,005,000)
Property and equipment, net	454,814,000		439,713,000															5,632,000	6,315,000			9,964,000	8,938,000							335,456,000	321,873,000			114,496,000	113,454,000			(10,734,000)	(10,867,000)
Investment in consolidated subsidiaries																		340,967,000				1,703,612,000	1,636,504,000							4,179,000	1,956,000							(2,048,758,000)	(1,638,460,000)
Restricted cash - long term	33,859,000		225,000																			33,636,000	2,000							223,000	223,000
Other long-term assets	199,636,000		202,751,000															81,472,000	84,055,000			410,344,000	375,687,000							58,363,000	60,114,000			122,514,000	112,757,000			(473,057,000)	(429,862,000)
Total other long-term assets	233,495,000		202,976,000															422,439,000	84,055,000			2,147,592,000	2,012,193,000							62,765,000	62,293,000			122,514,000	112,757,000			(2,521,815,000)	(2,068,322,000)
Goodwill and other intangible assets	1,848,163,000		1,782,560,000																											1,768,272,000	1,706,646,000			166,240,000	153,961,000			(86,349,000)	(78,047,000)
Total assets	3,343,393,000	[1]	2,729,697,000	[1]	2,160,241,000													427,937,000	93,343,000			2,682,610,000	2,031,610,000							2,408,688,000	2,353,727,000			446,086,000	412,258,000			(2,621,928,000)	(2,161,241,000)
Accounts payable and accrued liabilities	138,613,000		153,817,000															490,000	326,000			41,187,000	61,165,000							84,735,000	83,049,000			12,427,000	9,379,000			(226,000)	(102,000)
Current portion of long-term debt	19,094,000		47,622,000															518,000	483,000			4,621,000	31,113,000							903,000	800,000			13,052,000	15,226,000
Current portion of affiliate long-term debt	2,178,000		1,704,000															1,214,000	1,102,000											964,000	602,000			605,000	433,000			(605,000)	(433,000)
Other current liabilities	66,403,000		102,060,000															2,638,000												57,064,000	96,288,000			8,377,000	8,871,000			(1,676,000)	(3,099,000)
Liabilities held for sale			2,397,000																												2,397,000
Total current liabilities	226,288,000		307,600,000															4,860,000	1,911,000			45,808,000	92,278,000							143,666,000	183,136,000			34,461,000	33,909,000			(2,507,000)	(3,634,000)
Long-term debt	2,407,680,000		2,210,866,000															12,324,000	12,502,000			2,276,353,000	2,088,586,000							36,226,000	36,705,000			82,777,000	73,073,000
Affiliate long-term debt	20,220,000		13,187,000															5,633,000	6,303,000											14,587,000	6,884,000			277,835,000	267,521,000			(277,835,000)	(267,521,000)
Dividends in excess of investment in consolidated subsidiaries																			178,869,000																				(178,869,000)
Other liabilities	303,197,000		298,097,000															26,401,000	10,708,000			6,476,000	2,509,000							511,743,000	491,845,000			115,137,000	103,007,000			(356,560,000)	(309,972,000)
Total liabilities	2,957,385,000	[1]	2,829,750,000	[1]														49,218,000	210,293,000			2,328,637,000	2,183,373,000							706,222,000	718,570,000			510,210,000	477,510,000			(636,902,000)	(759,996,000)
Common stock	997,000																	997,000	812,000											10,000	10,000							(10,000)	(10,000)
Additional paid-in capital	1,088,639,000		600,928,000															1,088,639,000	600,928,000			261,323,000	(175,973,000)							1,005,263,000	1,084,302,000			54,119,000	64,096,000			(1,320,705,000)	(972,425,000)
Accumulated (deficit) earnings	(705,846,000)		(713,697,000)															(705,846,000)	(713,697,000)			96,103,000	27,597,000							700,232,000	553,777,000			(127,425,000)	(147,299,000)			(668,910,000)	(434,075,000)
Accumulated other comprehensive (loss) gain	(5,071,000)		(4,993,000)															(5,071,000)	(4,993,000)			(3,453,000)	(3,387,000)							(3,039,000)	(2,932,000)			1,893,000	1,054,000			4,599,000	5,265,000
Total Sinclair Broadcast Group shareholders' deficit	378,719,000		(116,950,000)															378,719,000	(116,950,000)			353,973,000	(151,763,000)							1,702,466,000	1,635,157,000			(71,413,000)	(82,149,000)			(1,985,026,000)	(1,401,245,000)
Noncontrolling interests in consolidated subsidiaries	7,289,000		16,897,000																															7,289,000	16,897,000
Total liabilities and equity (deficit)	$ 3,343,393,000		$ 2,729,697,000															$ 427,937,000	$ 93,343,000			$ 2,682,610,000	$ 2,031,610,000							$ 2,408,688,000	$ 2,353,727,000			$ 446,086,000	$ 412,258,000			$ (2,621,928,000)	$ (2,161,241,000)

[1] Our consolidated total assets as of June 30, 2013 and December 31, 2012 include total assets of variable interest entities (VIEs) of $122.6 million and $107.9 million, respectively, which can only be used to settle the obligations of the VIEs. Our consolidated total liabilities as of June 30, 2013 and December 31, 2012 include total liabilities of the VIEs of $10.4 million and $7.9 million, respectively, for which the creditors of the VIEs have no recourse to us.