Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Apr. 01, 2016 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 197,781
Goodwill, Acquired During Period	39,206
Foreign currency translation adjustment	912
Balance at end of period	237,899
Video [Member]
Goodwill [Line Items]
Balance at beginning of period	136,904
Goodwill, Acquired During Period	39,206
Foreign currency translation adjustment	933
Balance at end of period	177,043
Cable Edge [Member]
Goodwill [Line Items]
Balance at beginning of period	60,877
Foreign currency translation adjustment	(21)
Balance at end of period	$ 60,856