CONDENSED CONSOLIDATED FINANCIAL STATEMENTS: (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
Net revenue	$ 613,818	$ 494,956	$ 455,136	$ 412,648	$ 427,715	$ 338,644	$ 314,154	$ 282,618	$ 1,976,558	$ 1,363,131	$ 1,061,679
Program and production									577,013	385,104	255,556
Selling, general and administrative									440,019	302,858	204,670
Depreciation, amortization and other operating expenses									464,875	351,149	272,168
Total operating expenses									1,481,907	1,039,111	732,394
Operating income	208,949	101,663	103,039	81,000	103,286	72,798	84,280	63,656	494,651	324,020	329,285
Interest expense									(174,862)	(162,937)	(128,553)
Other income (expense)									(7,242)	(55,575)	11,608
Total other income (expense)									(182,104)	(218,512)	(116,945)
Income tax benefit (provision)									(97,432)	(41,249)	(67,852)
Income from discontinued operations, net of taxes						6,100	5,103	355		11,558	465
Net income (loss)									215,115	75,817	144,953
Net loss attributable to the noncontrolling interests									(2,836)	(2,349)	(287)
Net income (loss) attributable to Sinclair Broadcast Gr	95,445	48,341	41,335	27,158	2,303	36,342	17,826	16,997	212,279	73,468	144,666
Comprehensive income									211,759	78,257	144,808
Reportable legal entities | Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
Program and production										15
Selling, general and administrative									4,320	3,733	2,853
Depreciation, amortization and other operating expenses									1,068	1,307	1,523
Total operating expenses									5,388	5,055	4,376
Operating income									(5,388)	(5,055)	(4,376)
Equity in earnings (loss) of consolidated subsidiaries									211,782	97,138	144,620
Interest expense									(573)	(1,083)	(1,317)
Other income (expense)									4,377	4,633	5,245
Total other income (expense)									215,586	100,688	148,548
Income tax benefit (provision)									2,081	(22,165)	494
Net income (loss)									212,279	73,468	144,666
Net income (loss) attributable to Sinclair Broadcast Gr									212,279	73,468	144,666
Comprehensive income									211,759	78,257	144,808
Reportable legal entities | Sinclair Television Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
Program and production									76	357	322
Selling, general and administrative									57,799	48,363	28,762
Depreciation, amortization and other operating expenses									5,425	3,105	1,890
Total operating expenses									63,300	51,825	30,974
Operating income									(63,300)	(51,825)	(30,974)
Equity in earnings (loss) of consolidated subsidiaries									373,228	309,388	194,686
Interest expense									(163,347)	(152,174)	(118,491)
Other income (expense)									(14,651)	(59,033)	38,677
Total other income (expense)									195,230	98,181	114,872
Income tax benefit (provision)									83,897	47,645	41,709
Income from discontinued operations, net of taxes										11,063	(269)
Net income (loss)									215,827	105,064	125,338
Net income (loss) attributable to Sinclair Broadcast Gr									215,827	105,064	125,338
Comprehensive income									213,284	107,243	125,193
Reportable legal entities | Guarantor Subsidiaries and KDSM, LLC
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
Net revenue									1,870,408	1,296,736	1,008,146
Program and production									573,725	391,410	263,802
Selling, general and administrative									359,880	241,548	168,540
Depreciation, amortization and other operating expenses									367,514	275,889	213,681
Total operating expenses									1,301,119	908,847	646,023
Operating income									569,289	387,889	362,123
Equity in earnings (loss) of consolidated subsidiaries									(201)	1,009	(123)
Interest expense									(4,869)	(4,965)	(4,840)
Other income (expense)									998	245	(39,781)
Total other income (expense)									(4,072)	(3,711)	(44,744)
Income tax benefit (provision)									(185,193)	(73,266)	(118,519)
Income from discontinued operations, net of taxes										495	734
Net income (loss)									380,024	311,407	199,594
Net income (loss) attributable to Sinclair Broadcast Gr									380,024	311,407	199,594
Comprehensive income									378,926	311,407	199,594
Reportable legal entities | Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
Net revenue									192,616	123,017	64,909
Program and production									84,592	50,950	1,400
Selling, general and administrative									20,099	9,132	6,082
Depreciation, amortization and other operating expenses									92,635	71,319	55,802
Total operating expenses									197,326	131,401	63,284
Operating income									(4,710)	(8,384)	1,625
Interest expense									(27,364)	(25,624)	(24,780)
Other income (expense)									2,024	5,361	8,690
Total other income (expense)									(25,340)	(20,263)	(16,090)
Income tax benefit (provision)									1,783	2,637	8,464
Net income (loss)									(28,267)	(26,010)	(6,001)
Net loss attributable to the noncontrolling interests									(2,836)	(2,349)	(287)
Net income (loss) attributable to Sinclair Broadcast Gr									(31,103)	(28,359)	(6,288)
Comprehensive income									(27,982)	(28,098)	(6,288)
Eliminations
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
Net revenue									(86,466)	(56,622)	(11,376)
Program and production									(81,380)	(57,628)	(9,968)
Selling, general and administrative									(2,079)	82	(1,567)
Depreciation, amortization and other operating expenses									(1,767)	(471)	(728)
Total operating expenses									(85,226)	(58,017)	(12,263)
Operating income									(1,240)	1,395	887
Equity in earnings (loss) of consolidated subsidiaries									(584,809)	(407,535)	(339,183)
Interest expense									21,291	20,909	20,875
Other income (expense)									10	(6,781)	(1,223)
Total other income (expense)									(563,508)	(393,407)	(319,531)
Income tax benefit (provision)										3,900
Net income (loss)									(564,748)	(388,112)	(318,644)
Net income (loss) attributable to Sinclair Broadcast Gr									(564,748)	(388,112)	(318,644)
Comprehensive income									$ (564,228)	$ (388,112)	$ (318,499)