GOODWILL, BROADCAST LICENSES AND OTHER INTANGIBLE ASSETS: (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortized intangible assets:
Gross Carrying Amount	$ 954,126,000	$ 473,518,000
Accumulated Amortization	(330,720,000)	(298,177,000)
Net	623,406,000	175,341,000
Amortization expenses	38,099,000	18,229,000	18,834,000
Reclassification of goodwill to assets held for sale	(11,907,000)
Purchase of additional alarm monitoring contracts	12,454,000	8,850,000	10,106,000
Estimated amortization expense of the definite-lived intangible assets
Net	623,406,000	175,341,000
Amortized intangible assets:
Amortized intangible assets:
Net	623,406,000
Weighted-average useful life subject to amortization acquired	14 years
Amortization expenses	38,100,000	18,200,000	18,800,000
Estimated amortization expense of the definite-lived intangible assets
For the year ended December 31, 2013	56,741,000
For the year ended December 31, 2014	55,634,000
For the year ended December 31, 2015	55,325,000
For the year ended December 31, 2016	55,111,000
For the year ended December 31, 2017	54,658,000
Thereafter	345,937,000
Net	623,406,000
Amortized intangible assets: | Minimum
Amortized intangible assets:
Amortization period	5 years
Amortized intangible assets: | Maximum
Amortized intangible assets:
Amortization period	25 years
Network affiliations
Amortized intangible assets:
Gross Carrying Amount	580,929,000	244,900,000
Accumulated Amortization	(160,166,000)	(141,202,000)
Net	420,763,000	103,698,000
Assets acquired in acquisition	343,000,000
Estimated amortization expense of the definite-lived intangible assets
Net	420,763,000	103,698,000
Network affiliations | WLAJ-TV and WLWC-TV
Amortized intangible assets:
Reclassification of amortizable intangible assets to assets held for sale	6,900,000
Decaying advertiser base
Amortized intangible assets:
Gross Carrying Amount	178,094,000	122,375,000
Accumulated Amortization	(121,919,000)	(115,897,000)
Net	56,175,000	6,478,000
Assets acquired in acquisition	56,900,000
Estimated amortization expense of the definite-lived intangible assets
Net	56,175,000	6,478,000
Decaying advertiser base | WLAJ-TV and WLWC-TV
Amortized intangible assets:
Reclassification of amortizable intangible assets to assets held for sale	1,200,000
Other
Amortized intangible assets:
Gross Carrying Amount	195,103,000	106,243,000
Accumulated Amortization	(48,635,000)	(41,078,000)
Net	146,468,000	65,165,000
Assets acquired in acquisition	79,400,000
Purchase of additional alarm monitoring contracts	13,900,000	8,900,000
Estimated amortization expense of the definite-lived intangible assets
Net	146,468,000	65,165,000
Other | WLAJ-TV and WLWC-TV
Amortized intangible assets:
Reclassification of amortizable intangible assets to assets held for sale	$ 3,100,000