Acquisitions - Narrative (Details) (USD $)	9 Months Ended	12 Months Ended					9 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 30, 2011 ABC affiliates station	Dec. 30, 2011 Azteca America affiliates station	Sep. 30, 2012 McGraw-Hill Broadcasting Company Inc	Dec. 30, 2011 McGraw-Hill Broadcasting Company Inc	Sep. 30, 2012 Television network affiliation relationships McGraw-Hill Broadcasting Company Inc	Sep. 30, 2012 Advertiser relationships McGraw-Hill Broadcasting Company Inc	Sep. 30, 2012 Licensing agreements McGraw-Hill Broadcasting Company Inc
Acquisitions (Textual) [Abstract]
Acquisition cost in cash						$ 212,000,000
Working capital adjustment						4,400,000
Number of Stations Acquired			4	5
Goodwill accounting adjustments	625,000	625,000
Purchase price allocated to intangible assets					130,100,000
FCC licenses acquired									44,000,000
Value of television network affiliation relationships acquired							74,000,000
Estimated Amortization Period							20 years	10 years
Goodwill					$ 27,966,000