Final Purchase Price Allocation in Cmp Acquisition Among Tangible and Intangible Assets Acquired, and Liabilities Assumed (Detail) (USD $)		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012 CMP Acquisition
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Current assets		$ 61,598,000
Property and equipment	1,790,000	29,092,000
Broadcast licenses	11,190,000	317,917,000
Other intangibles	72,000	94,422,000
Goodwill	4,342,000	403,130,000
Other assets		11,014,000
Current liabilities		(12,869,000)
Other long-term liabilities		(5,730,000)
Deferred income taxes		(162,705,000)
Total purchase price		$ 735,869,000