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Operating Segments - Operating Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2017
Jul. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Depreciation expense $ 11,500 $ 12,000 $ 22,900 $ 23,700  
Amortization expense 27,113 26,263 50,782 51,795  
Severance, restructuring, and acquisition integration costs 9,560 5,869 16,160 14,277  
Segment assets 3,862,670   3,862,670   $ 3,806,803
Broadcast Solutions          
Segment Reporting Information [Line Items]          
Severance, restructuring, and acquisition integration costs 970 1,319 1,378 5,697  
Enterprise Solutions          
Segment Reporting Information [Line Items]          
Severance, restructuring, and acquisition integration costs 8,141 1,207 13,014 1,707  
Industrial Solutions          
Segment Reporting Information [Line Items]          
Severance, restructuring, and acquisition integration costs 346 2,371 1,467 3,236  
Reportable Segment          
Segment Reporting Information [Line Items]          
Segment revenues 610,633 603,381 1,162,014 1,147,181  
Affiliate revenues 1,946 1,719 5,052 4,052  
Segment EBITDA 110,227 108,335 203,337 198,401  
Depreciation expense 11,528 11,987 22,911 23,650  
Amortization expense 27,113 26,263 50,782 51,795  
Severance, restructuring, and acquisition integration costs 9,560 5,869 16,160 14,277  
Purchase accounting effects of acquisitions 1,167 0 1,167 195  
Deferred gross profit adjustments 0 1,750 0 4,053  
Segment assets 1,022,068 945,100 1,022,068 945,100  
Reportable Segment | Broadcast Solutions          
Segment Reporting Information [Line Items]          
Segment revenues 188,071 193,521 356,667 364,793  
Affiliate revenues 94 173 195 597  
Segment EBITDA 29,610 29,505 55,010 52,772  
Depreciation expense 4,058 4,061 8,007 8,023  
Amortization expense 13,453 13,420 23,468 26,351  
Severance, restructuring, and acquisition integration costs 970 1,319 1,378 5,697  
Purchase accounting effects of acquisitions 1,167   1,167 195  
Deferred gross profit adjustments   494   1,108  
Segment assets 359,160 329,250 359,160 329,250  
Reportable Segment | Enterprise Solutions          
Segment Reporting Information [Line Items]          
Segment revenues 160,733 160,401 306,415 296,293  
Affiliate revenues 1,545 1,328 4,103 3,027  
Segment EBITDA 26,801 29,575 50,901 53,311  
Depreciation expense 2,695 3,429 5,294 6,818  
Amortization expense 429 432 853 861  
Severance, restructuring, and acquisition integration costs 8,141 1,207 13,014 1,707  
Purchase accounting effects of acquisitions 0   0 0  
Deferred gross profit adjustments   0   0  
Segment assets 275,770 253,424 275,770 253,424  
Reportable Segment | Industrial Solutions          
Segment Reporting Information [Line Items]          
Segment revenues 159,255 147,808 305,436 288,899  
Affiliate revenues 275 214 662 396  
Segment EBITDA 31,036 27,064 56,769 50,051  
Depreciation expense 3,168 2,709 6,374 5,427  
Amortization expense 640 601 1,282 1,192  
Severance, restructuring, and acquisition integration costs 346 2,371 1,467 3,236  
Purchase accounting effects of acquisitions 0   0 0  
Deferred gross profit adjustments   0   0  
Segment assets 282,068 255,250 282,068 255,250  
Reportable Segment | Network Solutions          
Segment Reporting Information [Line Items]          
Segment revenues 102,574 101,651 193,496 197,196  
Affiliate revenues 32 4 92 32  
Segment EBITDA 22,780 22,191 40,657 42,267  
Depreciation expense 1,607 1,788 3,236 3,382  
Amortization expense 12,591 11,810 25,179 23,391  
Severance, restructuring, and acquisition integration costs 103 972 301 3,637  
Purchase accounting effects of acquisitions 0   0 0  
Deferred gross profit adjustments   1,256   2,945  
Segment assets $ 105,070 $ 107,176 $ 105,070 $ 107,176