Final Purchase Price Allocation in Citadel Acquisition among Tangible and Intangible Assets Acquired, and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Sep. 16, 2011
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Property and equipment	$ 443,338	$ 448,257
Other intangibles	258,761	390,509
Goodwill	131,997
Current liabilities	(11,386)
Total fair value for allocation			2,320,241
Citadel Acquisition
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Current assets			328,306
Property and equipment			222,454
Broadcast licenses			1,135,669
Other intangibles			333,480
Goodwill			860,548
Other assets			18,794
Current liabilities			(106,799)
Other long-term liabilities			(38,660)
Deferred income taxes			(433,551)
Total fair value for allocation			$ 2,320,241