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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 $ 66.0 $ 56.5 $ 61.2
Barter and trade expenses $ 58.5 $ 58.8 $ 63.4