This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References+ Details

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

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.

+ References+ Details

Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2013
Percentage of ownership				100.00%
Impairment		$ (1,146,000)	$ (2,100,000)
Other than temporary impairment for equity method investments	2,600,000	4,800,000	6,500,000
Other than temporary impairment for available for sale securities	4,600,000	4,800,000	6,500,000
Advertising expenses	113,400,000	92,200,000	82,000,000
International Outdoor Advertising [Member]
Other than temporary impairment for equity method investments			$ 8,300,000
Minimum [Member]
Percentage of ownership	20.00%			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%			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