Discontinued Operations - Recorded Gain With the Sale of Cable Access HFC Business (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 05, 2013	Mar. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill de-recognized		$ 14,547
Gain on disposal, net of tax		14,956
HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Proceeds	46,000	46,000
Inventories, net		10,487
Prepaid expenses and other current assets		612
Property and equipment, net		1,133
Goodwill de-recognized		14,547
Deferred revenue		(4,499)
Accrued liabilities		(939)
Total net assets sold and de-recognized		21,341
Less : selling cost		2,469
Less : Tax effect		7,234
Gain on disposal, net of tax		$ 14,956