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Operating Segments - Operating Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 02, 2016 | Sep. 27, 2015 | Oct. 02, 2016 | Sep. 27, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation expense | $ 11,600 | $ 11,800 | $ 35,300 | $ 35,100 |
Amortization expense | 23,808 | 25,669 | 75,603 | 78,090 |
Severance, restructuring, and acquisition integration costs | 12,795 | 14,143 | 27,072 | 33,533 |
Segment assets | 3,811,963 |  | 3,811,963 |  | $ 3,290,602
Broadcast Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 174 | 13,722 | 5,871 | 28,543 |
Enterprise Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 5,573 | 192 | 7,280 | 832 |
Industrial Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 4,746 | 118 | 7,982 | 3,054 |
Network Security Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 0 | 57 | 29 | 1,102 |
Reportable Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 602,468 | 590,115 | 1,749,649 | 1,758,079 |
Affiliate revenues | 2,157 | 2,064 | 6,209 | 6,514 |
Segment EBITDA | 111,936 | 98,005 | 310,337 | 286,602 |
Depreciation expense | 11,603 | 11,818 | 35,253 | 35,051 |
Amortization expense | 23,808 | 25,669 | 75,603 | 78,090 |
Severance, restructuring, and acquisition integration costs | 12,795 | 14,143 | 27,072 | 33,533 |
Purchase accounting effects of acquisitions | 0 | 0 | 195 | 9,422 |
Deferred gross profit adjustments | 1,359 | 11,328 | 5,412 | 46,426 |
Segment assets | 946,966 | 966,102 | 946,966 | 966,102 |
Reportable Segment [Member] | Broadcast Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 196,173 | 186,722 | 560,966 | 538,145 |
Affiliate revenues | 46 | 42 | 644 | 24 |
Segment EBITDA | 36,545 | 27,369 | 89,317 | 73,374 |
Depreciation expense | 4,063 | 4,027 | 12,086 | 12,140 |
Amortization expense | 10,955 | 12,354 | 37,306 | 37,375 |
Severance, restructuring, and acquisition integration costs | 174 | 13,722 | 5,871 | 28,532 |
Purchase accounting effects of acquisitions |  |  | 195 | 0 |
Deferred gross profit adjustments | 283 | 419 | 1,391 | 2,789 |
Segment assets | 314,020 | 346,271 | 314,020 | 346,271 |
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 156,658 | 155,148 | 452,951 | 458,756 |
Affiliate revenues | 1,587 | 1,630 | 4,615 | 5,328 |
Segment EBITDA | 27,294 | 25,705 | 80,605 | 75,506 |
Depreciation expense | 3,210 | 3,156 | 10,028 | 9,550 |
Amortization expense | 431 | 429 | 1,292 | 1,290 |
Severance, restructuring, and acquisition integration costs | 5,573 | 192 | 7,280 | 843 |
Purchase accounting effects of acquisitions |  |  | 0 | 0 |
Deferred gross profit adjustments | 0 | 0 | 0 | 0 |
Segment assets | 265,085 | 266,248 | 265,085 | 266,248 |
Reportable Segment [Member] | Industrial Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 149,847 | 147,702 | 438,746 | 461,549 |
Affiliate revenues | 511 | 355 | 906 | 1,086 |
Segment EBITDA | 23,649 | 23,225 | 73,700 | 76,078 |
Depreciation expense | 2,738 | 2,810 | 8,165 | 8,530 |
Amortization expense | 604 | 799 | 1,796 | 2,429 |
Severance, restructuring, and acquisition integration costs | 4,746 | 118 | 7,982 | 3,054 |
Purchase accounting effects of acquisitions |  |  | 0 | 267 |
Deferred gross profit adjustments | 0 | 0 | 0 | 0 |
Segment assets | 261,923 | 250,622 | 261,923 | 250,622 |
Reportable Segment [Member] | Industrial IT Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 60,168 | 59,184 | 176,560 | 181,527 |
Affiliate revenues | 13 | 37 | 44 | 68 |
Segment EBITDA | 12,771 | 10,466 | 34,056 | 31,731 |
Depreciation expense | 565 | 570 | 1,749 | 1,713 |
Amortization expense | 1,501 | 1,480 | 4,517 | 4,369 |
Severance, restructuring, and acquisition integration costs | 2,302 | 54 | 5,910 | 2 |
Purchase accounting effects of acquisitions |  |  | 0 | 0 |
Deferred gross profit adjustments | 0 | 0 | 0 | 0 |
Segment assets | 62,828 | 61,441 | 62,828 | 61,441 |
Reportable Segment [Member] | Network Security Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 39,622 | 41,359 | 120,426 | 118,102 |
Affiliate revenues | 0 | 0 | 0 | 8 |
Segment EBITDA | 11,677 | 11,240 | 32,659 | 29,913 |
Depreciation expense | 1,027 | 1,255 | 3,225 | 3,118 |
Amortization expense | 10,317 | 10,607 | 30,692 | 32,627 |
Severance, restructuring, and acquisition integration costs | 0 | 57 | 29 | 1,102 |
Purchase accounting effects of acquisitions |  |  | 0 | 9,155 |
Deferred gross profit adjustments | 1,076 | 10,909 | 4,021 | 43,637 |
Segment assets | $ 43,110 | $ 41,520 | $ 43,110 | $ 41,520 |

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