Intangible Assets Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 662,428		$ 483,256
Accumulated Amortization	(244,620)	[1]	(329,283)	[1]
Net	417,808		153,973
Customer, Affiliate And Advertiser Related Relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	293,612		162,389
Accumulated Amortization	(87,794)	[1]	(99,996)	[1]
Net	205,818		62,393
Developed Technology And Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	261,435		270,485
Accumulated Amortization	(120,936)	[1]	(198,851)	[1]
Net	140,499		71,634
Trade Names, Trademarks, And Domain Names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	107,381		50,382
Accumulated Amortization	(35,890)	[1]	(30,436)	[1]
Net	$ 71,491		$ 19,946

[1] Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, increased total intangible assets by approximately $19 million as of both December 31, 2012 and 2013.