Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Changes In Carrying Amount Of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Balance	$ 4,202,187us-gaap_Goodwill	$ 4,216,085us-gaap_Goodwill	$ 4,186,718us-gaap_Goodwill
Impairment		(10,684)us-gaap_GoodwillImpairmentLoss
Acquisitions	29,058us-gaap_GoodwillAcquiredDuringPeriod	97us-gaap_GoodwillAcquiredDuringPeriod	24,893us-gaap_GoodwillAcquiredDuringPeriod
Dispositions		(456)	(3,218)
Foreign currency	(18,693)us-gaap_GoodwillTranslationAdjustments	(974)us-gaap_GoodwillTranslationAdjustments	7,784us-gaap_GoodwillTranslationAdjustments
Other	60us-gaap_GoodwillOtherChanges	(1,881)us-gaap_GoodwillOtherChanges	(92)us-gaap_GoodwillOtherChanges
Balance	4,212,612us-gaap_Goodwill	4,202,187us-gaap_Goodwill	4,216,085us-gaap_Goodwill
iHM [Member]
Goodwill [Line Items]
Balance	3,234,807	3,236,688	3,212,427
Impairment		0
Acquisitions	28,760	0	24,842
Dispositions		0	(489)
Foreign currency	0	0	0
Other	60	(1,881)	(92)
Balance	3,263,627	3,234,807	3,236,688
Americas Outdoor Advertising [Member]
Goodwill [Line Items]
Balance	571,932	571,932	571,932
Impairment		0
Acquisitions	0	0	0
Dispositions		0	0
Foreign currency	0	0	0
Other	0	0	0
Balance	571,932	571,932	571,932
International Outdoor Advertising [Member]
Goodwill [Line Items]
Balance	278,202	290,316	285,261
Impairment		(10,684)		(1,100)
Acquisitions	0	0	0
Dispositions		(456)	(2,729)
Foreign currency	(18,693)	(974)	7,784
Other	0	0	0
Balance	259,509	278,202	290,316	285,261
Other [Member]
Goodwill [Line Items]
Balance	117,246	117,149	117,098
Impairment		0
Acquisitions	298	97	51
Dispositions		0	0
Foreign currency	0	0	0
Other	0	0	0
Balance	$ 117,544	$ 117,246	$ 117,149

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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