CONDENSED CONSOLIDATED FINANCIAL STATEMENTS: (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 12, 2013	Oct. 12, 2012	Mar. 31, 2013	Oct. 11, 2013	Sep. 30, 2013	Oct. 31, 2013
CONDENSED CONSOLIDATING BALANCE SHEET
Consolidated total debt	$ 3,928,700,000
Cash	17,682,000	280,104,000	22,865,000	12,967,000
Accounts and other receivables	383,503,000	309,156,000
Other current assets	118,476,000	108,611,000
Assets held for sale	6,504,000
Total current assets	526,165,000	697,871,000
Assets held for sale	8,817,000
Property and equipment, net	752,538,000	596,071,000
Restricted cash - long term		11,747,000
Other long-term assets	246,761,000	232,917,000
Total other long-term assets	255,578,000	244,664,000
Goodwill and other intangible assets	3,917,891,000	2,608,866,000
Total assets	5,452,172,000	4,147,472,000
Accounts payable and accrued liabilities	258,371,000	196,174,000
Current portion of long-term debt	113,116,000	46,346,000
Current portion of affiliate long-term debt	2,625,000	2,367,000
Other current liabilities	117,417,000	98,494,000
Liabilities held for sale	2,477,000
Total current liabilities	494,006,000	343,381,000
Long-term debt	3,796,666,000	2,966,402,000
Affiliate long-term debt	16,309,000	18,925,000
Other liabilities	739,848,000	413,060,000
Total liabilities	5,046,829,000	3,741,768,000
Total Sinclair Broadcast Group shareholders' deficit	427,882,000	396,370,000
Noncontrolling interests in consolidated subsidiaries	(22,539,000)	9,334,000
Total liabilities and equity (deficit)	5,452,172,000	4,147,472,000
5.375% Senior Unsecured Notes, due 2021
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	5.375%	5.375%
5.625% Senior Notes, due
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	5.625%	5.625%
6.125% Senior Unsecured Notes, due 2022
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	6.125%	6.125%			6.125%	6.125%
9.25% Senior Secured Second Lien Notes due 2017
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)							9.25%
6.375% Senior Notes, due 2021
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	6.375%	6.375%						6.375%
4.875% Notes
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	4.875%	4.875%							4.875%
3.0% Notes
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)		3.00%								3.00%
Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING BALANCE SHEET
Amount of debt guaranteed by parent	3,752,100,000
Sinclair Television Group, Inc.
CONDENSED CONSOLIDATING BALANCE SHEET
Consolidated total debt	3,801,700,000
Sinclair Television Group, Inc. | 5.375% Senior Unsecured Notes, due 2021
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	5.375%
Sinclair Television Group, Inc. | 5.625% Senior Notes, due
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	5.625%
Sinclair Television Group, Inc. | 6.125% Senior Unsecured Notes, due 2022
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	6.125%
Sinclair Television Group, Inc. | 6.375% Senior Notes, due 2021
CONDENSED CONSOLIDATING BALANCE SHEET
Interest rate (as a percent)	6.375%
Reportable legal entities | Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING BALANCE SHEET
Accounts and other receivables		59,000
Other current assets	5,741,000	5,500,000
Total current assets	5,741,000	5,559,000
Property and equipment, net	3,949,000	5,017,000
Investment in consolidated subsidiaries	395,225,000	363,231,000
Other long-term assets	65,988,000	78,849,000
Total other long-term assets	461,213,000	442,080,000
Total assets	470,903,000	452,656,000
Accounts payable and accrued liabilities	541,000	234,000
Current portion of long-term debt	529,000	556,000
Current portion of affiliate long-term debt	1,464,000	1,294,000
Other current liabilities	1,208,000	3,529,000
Total current liabilities	3,742,000	5,613,000
Long-term debt		529,000
Affiliate long-term debt	3,508,000	4,972,000
Other liabilities	35,771,000	45,172,000
Total liabilities	43,021,000	56,286,000
Total Sinclair Broadcast Group shareholders' deficit	427,882,000	396,370,000
Total liabilities and equity (deficit)	470,903,000	452,656,000
Reportable legal entities | Sinclair Television Group, Inc.
CONDENSED CONSOLIDATING BALANCE SHEET
Cash	3,394,000	237,974,000	7,230,000
Accounts and other receivables	164,000	818,000
Other current assets	12,996,000	25,887,000
Total current assets	16,554,000	264,679,000
Property and equipment, net	17,554,000	13,561,000
Investment in consolidated subsidiaries	3,585,037,000	2,508,058,000
Restricted cash - long term		11,524,000
Other long-term assets	595,112,000	503,674,000
Total other long-term assets	4,180,149,000	3,023,256,000
Goodwill and other intangible assets	1,483,000
Total assets	4,215,740,000	3,301,496,000
Accounts payable and accrued liabilities	46,083,000	51,781,000
Current portion of long-term debt	42,953,000	37,335,000
Total current liabilities	89,036,000	89,116,000
Long-term debt	3,679,004,000	2,793,334,000
Other liabilities	28,856,000	23,645,000
Total liabilities	3,796,896,000	2,906,095,000
Total Sinclair Broadcast Group shareholders' deficit	418,844,000	395,401,000
Total liabilities and equity (deficit)	4,215,740,000	3,301,496,000
Reportable legal entities | Guarantor Subsidiaries and KDSM, LLC
CONDENSED CONSOLIDATING BALANCE SHEET
Cash	1,749,000	28,594,000	199,000
Accounts and other receivables	359,486,000	281,822,000
Other current assets	98,751,000	67,279,000
Total current assets	459,986,000	377,695,000
Assets held for sale	1,843,000
Property and equipment, net	569,372,000	454,917,000
Investment in consolidated subsidiaries	3,978,000	4,179,000
Restricted cash - long term		223,000
Other long-term assets	90,914,000	62,435,000
Total other long-term assets	96,735,000	66,837,000
Goodwill and other intangible assets	3,821,985,000	2,486,794,000
Total assets	4,948,078,000	3,386,243,000
Accounts payable and accrued liabilities	201,102,000	126,245,000
Current portion of long-term debt	1,302,000	1,007,000
Current portion of affiliate long-term debt	1,182,000	1,073,000
Other current liabilities	107,867,000	87,612,000
Total current liabilities	311,453,000	215,937,000
Long-term debt	34,338,000	35,709,000
Affiliate long-term debt	12,802,000	13,984,000
Other liabilities	1,003,213,000	610,491,000
Total liabilities	1,361,806,000	876,121,000
Total Sinclair Broadcast Group shareholders' deficit	3,586,272,000	2,510,122,000
Total liabilities and equity (deficit)	4,948,078,000	3,386,243,000
Reportable legal entities | Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING BALANCE SHEET
Cash	12,539,000	13,536,000	15,436,000
Accounts and other receivables	25,111,000	27,479,000
Other current assets	12,721,000	16,391,000
Assets held for sale	6,504,000
Total current assets	56,875,000	57,406,000
Assets held for sale	6,974,000
Property and equipment, net	168,762,000	130,019,000
Other long-term assets	115,375,000	132,840,000
Total other long-term assets	122,349,000	132,840,000
Goodwill and other intangible assets	209,724,000	214,325,000
Total assets	557,710,000	534,590,000
Accounts payable and accrued liabilities	24,325,000	17,161,000
Current portion of long-term debt	68,332,000	6,900,000
Current portion of affiliate long-term debt	1,026,000	1,003,000
Other current liabilities	9,749,000	9,645,000
Liabilities held for sale	2,477,000
Total current liabilities	105,909,000	34,709,000
Long-term debt	83,324,000	135,071,000
Affiliate long-term debt	319,901,000	294,919,000
Other liabilities	169,935,000	145,828,000
Total liabilities	679,069,000	610,527,000
Total Sinclair Broadcast Group shareholders' deficit	(94,632,000)	(85,271,000)
Noncontrolling interests in consolidated subsidiaries	(26,727,000)	9,334,000
Total liabilities and equity (deficit)	557,710,000	534,590,000
Eliminations
CONDENSED CONSOLIDATING BALANCE SHEET
Accounts and other receivables	(1,258,000)	(1,022,000)
Other current assets	(11,733,000)	(6,446,000)
Total current assets	(12,991,000)	(7,468,000)
Property and equipment, net	(7,099,000)	(7,443,000)
Investment in consolidated subsidiaries	(3,984,240,000)	(2,875,468,000)
Other long-term assets	(620,628,000)	(544,881,000)
Total other long-term assets	(4,604,868,000)	(3,420,349,000)
Goodwill and other intangible assets	(115,301,000)	(92,253,000)
Total assets	(4,740,259,000)	(3,527,513,000)
Accounts payable and accrued liabilities	(13,680,000)	753,000
Current portion of long-term debt		548,000
Current portion of affiliate long-term debt	(1,047,000)	(1,003,000)
Other current liabilities	(1,407,000)	(2,292,000)
Total current liabilities	(16,134,000)	(1,994,000)
Long-term debt		1,759,000
Affiliate long-term debt	(319,902,000)	(294,950,000)
Other liabilities	(497,927,000)	(412,076,000)
Total liabilities	(833,963,000)	(707,261,000)
Total Sinclair Broadcast Group shareholders' deficit	(3,910,484,000)	(2,820,252,000)
Noncontrolling interests in consolidated subsidiaries	4,188,000
Total liabilities and equity (deficit)	$ (4,740,259,000)	$ (3,527,513,000)