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Barter and Trade Revenues and Expenses from Continuing Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Barter and trade revenues $ 69.4 $ 66.0 $ 56.5
Barter and trade expenses $ 68.1 $ 58.5 $ 58.8