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Other Information - Barter and Trade Revenues and Expenses from Continuing Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Barter and trade revenues | $ 31.0 | $ 19.9 | $ 87.6 | $ 54.2
Barter and trade expenses | $ 31.0 | $ 22.7 | $ 84.1 | $ 55.1

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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