Summary of Significant Accounting Policies - Narrative (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Television network affiliation relationships Minimum	Dec. 31, 2012 Customer lists and other intangible assets	Dec. 31, 2012 Licensing agreements Maximum	Dec. 31, 2012 Marketing services Product concentration
Summary of Significant Accounting Policies [Line Items]
Operating revenues derived from marketing services, including advertising						79.00%
FCC license term					8 years
Estimated useful life			20 years	20 years
Estimated liabilities for unpaid claims	$ 21.2	$ 20.7