Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 15, 2010
Finite-Lived Intangible Assets [Line Items]
Balance at beginning of period	$ 212,417	$ 211,878
Foreign currency translation adjustment	101	(3)
Balance at end of period	212,518	212,417
Omneon [Member]
Finite-Lived Intangible Assets [Line Items]
Balance at beginning of period			147,800
Adjustment to deferred tax liability associated with the acquisition of Omneon		(527)
Adjustment to fixed assets associated with the acquisition of Omneon		298
Adjustment to income tax payable associated with the acquisition of Omneon		771
Balance at end of period	$ 147,750		$ 147,800