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Business Combination - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Aug. 14, 2012 Zencoder [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Purchase price	$ 27,379		$ 27,379
Merger-related expenses	545	0
Payment to retain certain key employees	$ 2,667
Retention period	2 years

- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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