Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 197,884
Foreign currency translation adjustment	(103)
Balance at end of period	197,781
Video [Member]
Goodwill [Line Items]
Balance at beginning of period	136,975
Foreign currency translation adjustment	(71)
Balance at end of period	136,904
Cable Edge [Member]
Goodwill [Line Items]
Balance at beginning of period	60,909
Foreign currency translation adjustment	(32)
Balance at end of period	$ 60,877