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Other Information - Barter and Trade Revenues and Expenses from Continuing Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Barter and trade revenues $ 22.2 $ 17.9 $ 52.2 $ 31.5
Barter and trade expenses $ 23.4 $ 16.4 $ 51.5 $ 29.9