Represents the reallocation of goodwill for change in segments.

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- Definition

Represents the number of units of the entity.

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No definition available.

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Represents the number of significant acquisitions during the period.

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Represents the percentage by which the fair value exceeded the carrying value of the reporting unit.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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- Definition

The accumulated impairment losses related to goodwill as of the balance sheet date.

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- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended												3 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2002	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2011 MIJO Corporation ("MIJO")	Dec. 31, 2011 MediaMind Technologies ("Mediamind")	Dec. 31, 2012 Peer39, Inc	Dec. 31, 2011 EyeWonder LLC and Chors GmbH ("EyeWonder")	Dec. 31, 2012 North Country, Inc.	Dec. 31, 2011 Video and Audio Content Distribution	Dec. 31, 2012 Television	Dec. 31, 2011 Television	Dec. 31, 2011 Television MIJO Corporation ("MIJO")	Dec. 31, 2012 Television North Country, Inc.	Sep. 30, 2012 Online	Dec. 31, 2012 Online	Dec. 31, 2011 Online	Dec. 31, 2011 Online MediaMind Technologies ("Mediamind")	Dec. 31, 2012 Online Peer39, Inc	Dec. 31, 2011 Online EyeWonder LLC and Chors GmbH ("EyeWonder")	Dec. 31, 2012 Source Ecreative	Dec. 31, 2011 Source Ecreative	Dec. 31, 2010 Source Ecreative
Goodwill and Other Long-Lived Assets
Number of reportable units				3
Number of reportable segments				2
Changes in carrying value of goodwill by reporting unit
Balance at the beginning of the period				$ 711,520	$ 357,548						$ 355,550	$ 363,068					$ 346,454					$ 1,998	$ 1,998	$ 1,998
Accumulated impairment losses				(131,291)	(131,291)						(131,291)	(131,291)
Balance at the beginning of the period				580,229	226,257						224,259	231,777					346,454					1,998	1,998	1,998
Purchase						19,524	292,117	7,225	43,437	823				19,524	823				292,117	7,225	43,437
Goodwill impairment loss	(11,427)	(208,166)	(131,300)	(219,593)												(11,400)	(219,593)
Foreign currency translation				453	(1,106)							453	(1,106)
Balance at the end of the period	720,021			720,021	711,520							364,344	363,068				353,679	346,454				1,998	1,998	1,998
Accumulated impairment losses	(350,884)			(350,884)	(131,291)							(131,291)	(131,291)				(219,593)
Balance at the end of the period	369,137			369,137	580,229							233,053	231,777				134,086	346,454				1,998	1,998	1,998
Reallocation of goodwill for change in segments											$ (224,259)		$ 213,359					$ 10,900
Number of significant acquisitions				2
Excess percentage of fair value over carrying value												13.00%	33.00%					6.00%				977.00%