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Summary of Significant Accounting Policies - Barter and Trade Revenues and Expenses from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Barter and trade revenues	$ 132.5	$ 77.6	$ 71.3
Barter and trade expenses	$ 110.9	$ 74.7	$ 65.5

X

- 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

X

- 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