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Operating Segments and Geographic Information - Operating Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 27, 2015
Jun. 28, 2015
Mar. 29, 2015
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Segment revenues $ 597,244 $ 579,266 $ 585,755 $ 546,957 $ 608,910 $ 610,774 $ 600,891 $ 487,690 $ 2,309,222 $ 2,308,265 $ 2,069,193
Depreciation expense                 46,600 43,700 43,600
Amortization of intangibles                 103,791 58,426 50,803
Severance, restructuring, and acquisition integration costs 13,600 $ 14,100 $ 4,900 $ 14,600 22,000 $ 9,200 38,200 $ 1,400 47,170 70,827 14,888
Purchase accounting effects of acquisitions             $ 7,400        
Acquisition of property, plant and equipment                 54,969 45,459 40,209
Segment assets 3,315,841       3,260,670       3,315,841 3,260,670 2,751,753
Broadcast Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Severance, restructuring, and acquisition integration costs                 39,078 48,557 12,128
Enterprise Connectivity Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Severance, restructuring, and acquisition integration costs                 723 3,318 400
Industrial Connectivity Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Severance, restructuring, and acquisition integration costs                 6,228 11,953 700
Network Security Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Severance, restructuring, and acquisition integration costs                 972    
Reportable Segment [Member]                      
Segment Reporting Information [Line Items]                      
Segment revenues                 2,360,583 2,320,219 2,084,490
Affiliate revenues                 8,384 12,829 12,865
Segment EBITDA                 401,750 360,426 322,080
Depreciation expense                 46,551 43,736 43,648
Amortization of intangibles                 103,791 58,426 50,803
Severance, restructuring, and acquisition integration costs                 47,170 70,827 14,888
Purchase accounting effects of acquisitions                 9,747 12,540 6,550
Deferred gross profit adjustments                 52,876 10,777 11,337
Acquisition of property, plant and equipment                 53,572 42,442 38,791
Segment assets 934,280       960,782       934,280 960,782 833,585
Reportable Segment [Member] | Broadcast Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Segment revenues                 900,637 928,586 679,197
Affiliate revenues                 1,371 1,381 933
Segment EBITDA                 142,428 140,367 109,541
Depreciation expense                 17,103 16,553 18,422
Amortization of intangibles                 50,989 50,739 46,005
Severance, restructuring, and acquisition integration costs                 39,078 48,557 12,128
Purchase accounting effects of acquisitions                 132 8,574 6,550
Deferred gross profit adjustments                 2,446 10,777 11,337
Acquisition of property, plant and equipment                 27,900 17,912 10,526
Segment assets 394,197       430,991       394,197 430,991 294,454
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Segment revenues                 445,243 455,795 493,129
Affiliate revenues                 5,322 8,467 9,823
Segment EBITDA                 71,508 66,035 62,165
Depreciation expense                 11,783 13,744 12,469
Amortization of intangibles                 543 650 543
Severance, restructuring, and acquisition integration costs                 723 3,318 400
Purchase accounting effects of acquisitions                 52 608  
Acquisition of property, plant and equipment                 9,788 12,574 11,749
Segment assets 190,298       206,377       190,298 206,377 223,073
Reportable Segment [Member] | Industrial Connectivity Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Segment revenues                 603,350 682,374 680,643
Affiliate revenues                 1,613 2,927 1,901
Segment EBITDA                 99,941 106,097 104,655
Depreciation expense                 11,235 11,145 10,308
Amortization of intangibles                 3,154 1,236 1,085
Severance, restructuring, and acquisition integration costs                 6,228 11,953 700
Purchase accounting effects of acquisitions                 334 1,328  
Acquisition of property, plant and equipment                 8,836 10,053 14,496
Segment assets 231,265       255,997       231,265 255,997 259,400
Reportable Segment [Member] | Industrial IT Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Segment revenues                 244,303 253,464 231,521
Affiliate revenues                 70 54 208
Segment EBITDA                 43,253 47,927 45,719
Depreciation expense                 2,293 2,294 2,449
Amortization of intangibles                 5,859 5,801 3,170
Severance, restructuring, and acquisition integration costs                 169 6,999 1,660
Purchase accounting effects of acquisitions                 32 2,030  
Acquisition of property, plant and equipment                 2,039 1,903 2,020
Segment assets 55,285       $ 67,417       55,285 $ 67,417 $ 56,658
Reportable Segment [Member] | Network Security Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Segment revenues                 167,050    
Affiliate revenues                 8    
Segment EBITDA                 44,620    
Depreciation expense                 4,137    
Amortization of intangibles                 43,246    
Severance, restructuring, and acquisition integration costs                 972    
Purchase accounting effects of acquisitions                 9,197    
Deferred gross profit adjustments                 50,430    
Acquisition of property, plant and equipment                 5,009    
Segment assets $ 63,235               $ 63,235