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Commitments, Contingencies And Guarantees (Narrative) (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2014
USD ($)
Sign
Permit
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Commitments And Contingencies [Line Items]      
Rent expense | $ $ 1,170.0 $ 1,160.0 $ 1,140.0
Digital modernization permits issued to Company 82    
Digital displays operating 77    
Conversion from static to digital | Sign 83    
Performance Requirements [Member]      
Commitments And Contingencies [Line Items]      
Estimated Maximum Contingency | $ $ 30.0