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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

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