Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impairment	$ 10,684,000us-gaap_GoodwillImpairmentLoss		$ 0us-gaap_GoodwillImpairmentLoss
Other than temporary impairment for available for sale securities	0	0	4,600,000
Advertising expenses	103,000,000us-gaap_AdvertisingExpense	133,700,000us-gaap_AdvertisingExpense	113,400,000us-gaap_AdvertisingExpense
International Outdoor Advertising [Member]
Impairment	$ 10,700,000
Minimum [Member]
Percentage of ownership	20.00%
Minimum [Member] \| Building and Improvements [Member]
Useful life	10 years
Minimum [Member] \| Structures [Member]
Useful life	5 years
Minimum [Member] \| Towers, Transmitters and Studio Equipment [Member]
Useful life	7 years
Minimum [Member] \| Furniture and other equipment [Member]
Useful life	3 years
Maximum [Member]
Percentage of ownership	50.00%
Maximum [Member] \| Building and Improvements [Member]
Useful life	39 years
Maximum [Member] \| Structures [Member]
Useful life	15 years
Maximum [Member] \| Towers, Transmitters and Studio Equipment [Member]
Useful life	20 years
Maximum [Member] \| Furniture and other equipment [Member]
Useful life	20 years