Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jul. 01, 2016 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 197,781
Goodwill, Acquired During Period	37,630
Foreign currency translation adjustment	(42)
Balance at end of period	235,369
Video [Member]
Goodwill [Line Items]
Balance at beginning of period	136,904
Goodwill, Acquired During Period	37,630
Foreign currency translation adjustment	26
Balance at end of period	174,560
Cable Edge [Member]
Goodwill [Line Items]
Balance at beginning of period	60,877
Foreign currency translation adjustment	(68)
Balance at end of period	$ 60,809