Omneon Acquisition - Summarized Purchase Price at Fair Value of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Omneon [Member]	Sep. 15, 2010 Omneon [Member]	Dec. 31, 2012 Omneon [Member] Existing technology [Member]	Dec. 31, 2012 Omneon [Member] Customer Contracts [Member]	Dec. 31, 2012 Omneon [Member] Patents and core technology [Member]	Dec. 31, 2012 Omneon [Member] In-process technology [Member]	Dec. 31, 2012 Omneon [Member] Maintenance agreements [Member]	Dec. 31, 2012 Omneon [Member] Trade names and trademarks [Member]	Dec. 31, 2012 Omneon [Member] Order backlog [Member]
Business Acquisition [Line Items]
Total purchase consideration				$ 291,802
Net tangible asset acquired				34,952
Total intangible assets				109,100		50,800	29,200	9,800	9,000	5,500	4,000	800
Goodwill	212,518	212,417	211,878	147,750	147,800
Cash and cash equivalents				40,485	40,500
Accounts receivable, net				17,055
Inventories				11,010
Property and equipment, net				12,093
Deferred income tax assets				18,021
Other tangible assets				3,294
Accounts payable				(6,829)
Deferred revenue				(6,399)
Deferred income tax liabilities				(42,575)
Other accrued liabilities				(11,203)
Net tangible asset acquired				$ 34,952