Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 30, 2018 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 242,827
Foreign currency translation adjustment	978
Balance at end of period	243,805
Video [Member]
Goodwill [Line Items]
Balance at beginning of period	182,012
Foreign currency translation adjustment	954
Balance at end of period	182,966
Cable Edge [Member]
Goodwill [Line Items]
Balance at beginning of period	60,815
Foreign currency translation adjustment	24
Balance at end of period	$ 60,839