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Intangible Assets - Changes in Carrying Amount of Trademarks (Detail) - Trademarks [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]    
Trademarks, Beginning Balance $ 129,671 $ 103,040
Acquisitions and purchase accounting adjustments   31,000
Translation impact (4,794) (4,369)
Reclassify to assets held for sale (2,905)  
Trademarks, Ending Balance 121,972 129,671
Broadcast Solutions [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Trademarks, Beginning Balance 80,922 83,120
Translation impact (4,635) (2,198)
Trademarks, Ending Balance 76,287 80,922
Enterprise Connectivity Solutions [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Trademarks, Beginning Balance 4,063 4,063
Trademarks, Ending Balance 4,063 4,063
Industrial Connectivity Solutions [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Trademarks, Beginning Balance 9,090 10,744
Translation impact 40 (1,654)
Reclassify to assets held for sale (2,905)  
Trademarks, Ending Balance 6,225 9,090
Industrial IT Solutions [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Trademarks, Beginning Balance 4,596 5,113
Translation impact (199) (517)
Trademarks, Ending Balance 4,397 4,596
Network Security Solutions [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Trademarks, Beginning Balance 31,000 0
Acquisitions and purchase accounting adjustments   31,000
Trademarks, Ending Balance $ 31,000 $ 31,000