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Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Impairment	$ 10,684,000
Other than temporary impairment for equity method investments		2,600,000	4,800,000
Other than temporary impairment for available for sale securities		4,600,000	4,800,000
Advertising expenses	133,700,000	113,400,000	92,200,000
Additional deferred foreign tax expense	3,400,000
International Outdoor Advertising [Member]
Impairment	$ 10,700,000		$ 1,100,000
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

X

- Definition

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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