Segment Information - Summary of Revenue by Product Type (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Number of reportable segments	1
Total revenues	$ 461,940	$ 476,871	$ 490,874
Video processing products [Member]
Revenue from External Customer [Line Items]
Total revenues	219,667	219,441	236,567
Production and playout products [Member]
Revenue from External Customer [Line Items]
Total revenues	87,799	90,246	98,842
Cable edge products [Member]
Revenue from External Customer [Line Items]
Total revenues	69,132	86,637	85,679
Service and support [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 85,342	$ 80,547	$ 69,786