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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 HFC business [Member]	Dec. 31, 2012 HFC business [Member]	Dec. 31, 2011 HFC business [Member]	Mar. 29, 2013 HFC business [Member]	Mar. 05, 2013 Aurora [Member] HFC business [Member]	Dec. 31, 2013 Aurora [Member] HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Proceeds								$ 46,000
Inventories, net				10,579
Prepaid expenses and other current assets				612
Property and equipment, net				1,194
Goodwill de-recognized	14,547	0		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	$ 0	$ 14,663	$ 0	$ 0			$ 14,663