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	6 Months Ended
	Mar. 05, 2013	Jun. 28, 2013	Jun. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill de-recognized		$ 14,547	$ 14,547
Gain on disposal, net of tax			14,819
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		10,579	10,579
Prepaid expenses and other current assets		612	612
Property and equipment, net		1,180	1,180
Goodwill de-recognized		14,547	14,547
Deferred revenue		(4,499)	(4,499)
Accrued liabilities		(939)	(939)
Total net assets sold and de-recognized		21,480	21,480
Less : Selling cost			2,467
Less : Tax effect			7,234
Gain on disposal, net of tax		$ (137)	$ 14,819