Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Changes In Carrying Amount Of Goodwill) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Balance	$ 4,128,887	$ 4,187,424
Acquisitions	0	10,998
Dispositions	(6,934)	0
Foreign currency	8,624	(20,353)
Assets held for sale	(10,337)	(49,182)
Other	0
Balance	4,120,240	4,128,887
iHM [Member]
Goodwill [Line Items]
Balance	3,288,481	3,288,481
Acquisitions	0	0
Dispositions	0	0
Foreign currency	0	0
Other	0
Balance	3,288,481	3,288,481
Americas Outdoor Advertising [Member]
Goodwill [Line Items]
Balance	534,683	584,574
Acquisitions	0	0
Dispositions	(6,934)	0
Foreign currency	(1,210)	(709)
Assets held for sale	(10,337)	(49,182)
Other	0
Balance	516,202	534,683
International Outdoor Advertising [Member]
Goodwill [Line Items]
Balance	223,892	232,538
Acquisitions	0	10,998
Dispositions	0	0
Foreign currency	9,834	(19,644)
Other	0
Balance	233,726	223,892
Other [Member]
Goodwill [Line Items]
Balance	81,831	81,831
Acquisitions	0	0
Dispositions	0	0
Foreign currency	0	0
Other	0
Balance	$ 81,831	$ 81,831