Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended				3 Months Ended	12 Months Ended	0 Months Ended	36 Months Ended	12 Months Ended			0 Months Ended
	May 14, 2014	Jul. 31, 2013	Feb. 28, 2013	Jan. 31, 2013	Mar. 30, 2012	Dec. 31, 2010	Jul. 31, 2002	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 24, 2013	Apr. 30, 2012
Class of Stock [Line Items]
Preferred stock authorized								5,000,000	5,000,000	5,000,000
Authorized stock repurchase value								$ 300,000,000	$ 300,000,000				$ 25,000,000
Increase in stock repurchase program	80,000,000	85,000,000	35,000,000	75,000,000
Common stock repurchase program, authorized amount remaining								68,700,000	68,700,000
Omneon [Member]
Class of Stock [Line Items]
Cash deposited to secure post-closing indemnification obligations of holders						21,000,000
Number of common stock deposited to secure post-closing indemnification obligations of holders						1,926,920
Reimbursement received from escrow in cash					500,000
Reimbursement received from escrow common stock value					300,000
Claim for reimbursement received from escrow					800,000
Reimbursement received from escrow common stock shares					40,372
Series A Participating Preferred Stock [Member] | Stockholders Rights Plan [Member]
Class of Stock [Line Items]
Preferred stock authorized							100,000
Stockholder rights plan term, period							10 years
Stockholder rights plan, expiry date							Jul. 01, 2012
Common Stock [Member]
Class of Stock [Line Items]
Common stock repurchased and retired, shares								37,300,000
Common stock repurchased and retired, per shares value								$ 6.21
Common stock repurchased and retired, aggregate value								232,300,000
Common Stock [Member] | Acquisition of Omneon [Member]
Class of Stock [Line Items]
Common stock, shares issued						14,150,122
Purchase price paid as common stocks						95,900,000
Open Market Transaction [Member]
Class of Stock [Line Items]
Common stock repurchased and retired, shares									13,900,000	6,300,000	5,100,000
Common stock repurchased and retired, per shares value									$ 6.70	$ 6.48	$ 4.43
Common stock repurchased and retired, aggregate value									93,100,000	40,600,000	22,600,000
Dutch Auction Tender Offer [Member]
Class of Stock [Line Items]
Common stock repurchased and retired, shares												12,000,000
Common stock repurchased and retired, per shares value												$ 6.25
Common stock repurchased and retired, aggregate value												76,000,000
Additional Paid-in Capital [Member] | Dutch Auction Tender Offer [Member]
Class of Stock [Line Items]
Common stock repurchased and retired, aggregate value								$ 1,000,000				$ 1,000,000