Discontinued Operations - Recorded Gain With the Sale of Cable Access HFC Business (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 05, 2013	Mar. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal, net of taxes	$ 0	$ 14,663	$ 0
HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventories, net		10,579
Prepaid expenses and other current assets		612
Property and equipment, net		1,194
Goodwill de-recognized		14,547			14,500
Deferred revenue		(4,499)
Accrued liabilities		(939)
Total net assets sold and de-recognized		21,494
Less : Selling cost		2,485
Less : Tax effect		7,358
Gain on disposal, net of taxes		14,663	0
Aurora [Member] | HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Proceeds				46,000
Gain on disposal, net of taxes		$ 14,663