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Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Changes In Carrying Amount Of Goodwill) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Balance $ 4,202,187 $ 4,216,085
Impairment   (10,684)
Acquisitions 18,199 97
Dispositions   (456)
Foreign currency (33,022) (974)
Other 60 (1,881)
Balance 4,187,424 4,202,187
iHM [Member]    
Goodwill [Line Items]    
Balance 3,234,807 3,236,688
Impairment   0
Acquisitions 17,900 0
Dispositions   0
Foreign currency 0 0
Other 60 (1,881)
Balance 3,252,767 3,234,807
Americas Outdoor Advertising [Member]    
Goodwill [Line Items]    
Balance 585,227 585,307
Impairment   0
Acquisitions 0 0
Dispositions   0
Foreign currency (653) (80)
Other 0  
Balance 584,574 585,227
International Outdoor Advertising [Member]    
Goodwill [Line Items]    
Balance 264,907 276,941
Impairment (10,700) (10,684)
Acquisitions 0 0
Dispositions   (456)
Foreign currency (32,369) (894)
Other 0  
Balance 232,538 264,907
Other [Member]    
Goodwill [Line Items]    
Balance 117,246 117,149
Impairment   0
Acquisitions 299 97
Dispositions   0
Foreign currency 0 0
Other 0 0
Balance $ 117,545 $ 117,246