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Barter and Trade Revenues and Expenses from Continuing Operations (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Barter and trade revenues $ 66.0us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue $ 56.5us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue $ 61.2us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue
Barter and trade expenses $ 58.5us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts $ 58.8us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts $ 63.4us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts