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Segment Information - Summary of Revenue by Product Type (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Revenue by type, Total	$ 530,464	$ 549,332	$ 423,344
Video processing products [Member]
Revenue from External Customer [Line Items]
Revenue by type, Total	219,440	236,624	202,898
Production and playout products [Member]
Revenue from External Customer [Line Items]
Revenue by type, Total	90,247	98,842	32,579
Edge and access products [Member]
Revenue from External Customer [Line Items]
Revenue by type, Total	138,653	141,880	135,306
Service and support [Member]
Revenue from External Customer [Line Items]
Revenue by type, Total	$ 82,124	$ 71,986	$ 52,561

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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