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Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Changes In Carrying Amount Of Goodwill) (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Balance $ 4,187,424 $ 4,202,187
Impairment   0
Acquisitions 0 18,199
Dispositions 0 0
Foreign currency (16,070) (33,022)
Other 0 60
Balance 4,171,354 4,187,424
iHM [Member]    
Goodwill [Line Items]    
Balance 3,288,481 3,270,521
Impairment   0
Acquisitions 0 17,900
Dispositions 0 0
Foreign currency 0 0
Other 0 60
Balance 3,288,481 3,288,481
Americas Outdoor Advertising [Member]    
Goodwill [Line Items]    
Balance 584,574 585,227
Impairment   0
Acquisitions 0 0
Dispositions 0 0
Foreign currency (636) (653)
Other 0 0
Balance 583,938 584,574
International Outdoor Advertising [Member]    
Goodwill [Line Items]    
Balance 232,538 264,907
Impairment   0
Acquisitions 0 0
Dispositions 0 0
Foreign currency (15,434) (32,369)
Other 0 0
Balance 217,104 232,538
Other [Member]    
Goodwill [Line Items]    
Balance 81,831 81,532
Impairment   0
Acquisitions 0 299
Dispositions 0 0
Foreign currency 0 0
Other 0 0
Balance $ 81,831 $ 81,831