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Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Balance at beginning of period $ 237,279 $ 197,781
Goodwill, Acquired During Period   41,670
Foreign currency translation adjustment 5,548 (2,172)
Balance at end of period 242,827 237,279
Video [Member]    
Goodwill [Line Items]    
Balance at beginning of period 176,519 136,904
Goodwill, Acquired During Period   41,670
Foreign currency translation adjustment 5,493 (2,055)
Balance at end of period 182,012 176,519
Cable Edge [Member]    
Goodwill [Line Items]    
Balance at beginning of period 60,760 60,877
Foreign currency translation adjustment 55 (117)
Balance at end of period $ 60,815 $ 60,760