Discontinued Operations - Recorded Gain With the Sale of Cable Access HFC Business (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 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	$ 0	$ 14,663
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
Aurora [Member] | HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds from sale of cable access HFC business			46,000
Gain on disposal, net of taxes			$ 14,663