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Barter and Trade Revenues and Expenses from Continuing Operations (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Barter and trade revenues | $ 69.4 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue | $ 66.0 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue | $ 56.5 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue
Barter and trade expenses | $ 68.1 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts | $ 58.5 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts | $ 58.8 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts

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- Definition Total expense recognized from advertising barter transactions for each income statement presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406959&loc=d3e49171-111630 + Details
Name: | us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total revenue recognized from advertising barter transactions for each income statement presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406959&loc=d3e49171-111630 + Details
Name: | us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration