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Property, Plant and Equipment - Summary of Major Categories of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified					12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Land [Member]	Dec. 31, 2011 Land [Member]	Dec. 31, 2012 Land [Member] Minimum [Member]	Dec. 31, 2012 Land [Member] Maximum [Member]	Dec. 31, 2012 Building and improvements [Member]	Dec. 31, 2011 Building and improvements [Member]	Dec. 31, 2012 Building and improvements [Member] Minimum [Member]	Dec. 31, 2012 Building and improvements [Member] Maximum [Member]	Dec. 31, 2012 Advertising structures [Member]	Dec. 31, 2011 Advertising structures [Member]	Dec. 31, 2012 Advertising structures [Member] Minimum [Member]	Dec. 31, 2012 Advertising structures [Member] Maximum [Member]	Dec. 31, 2012 Automotive and other equipment [Member]	Dec. 31, 2011 Automotive and other equipment [Member]	Dec. 31, 2012 Automotive and other equipment [Member] Minimum [Member]	Dec. 31, 2012 Automotive and other equipment [Member] Maximum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, Estimated life									10 years	39 years			5 years	15 years			3 years	7 years
Property, plant and equipment	$ 2,940,449	$ 2,860,592	$ 317,223	$ 307,968			$ 115,646	$ 108,820			$ 2,378,940	$ 2,309,775			$ 128,640	$ 134,029

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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